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using a telescope to photograph solar events requires a light filter & a solar flare is a kind of solar event & a solar prominence is a kind of solar event | using a telescope to photograph a solar prominence and a solar flare requires a light filter |
a telescope is used for observing planets & venus is a kind of planet | a telescope can be used for observing venus |
a telescope can be used for observing venus & venus has moon-like phases | a telescope can be used to observe the moon-like phases of venus |
an optical telescope requires visible light for human to use & clouds / dusts block visible light | if there is clouds or dusts, then the optical telescope cannot be used |
if there is clouds or dusts, then the optical telescope cannot be used & radio telescopes can see through clouds and dust | the radio telescopes can still be used when there is clouds or dusts |
detailed observation of celestial objects requires a telescope & if something is required for something else then that something allows that something else | telescopes allow the detailed observation of celestial objects |
telescopes allow the detailed observation of celestial objects & a planet is a kind of celestial object / celestial body | telescopes allow the detailed observation of planets |
a moon phase occurs 28 days after the last time it occurred & a full moon is a kind of phase of the moon | a full moon will occur 28 days after the last time it occurs |
a full moon will occur 28 days after the last time it occurs & 1 month is equal to 28-31 days | a full moon will occur after 1 month it occurs |
the new moon is when the dark half of the moon faces the earth & a new moon is a kind of phase of the moon & the new moon is when the lighted half of the moon faces the sun | the moon phase where the lighted half of the moon faces the sun and dark half of the moon faces the earth is called new moon |
each of the moon 's phases occurs once per month & a full moon is a kind of phase of the moon | a full moon occurs once per month |
the new moon is when the dark half of the moon faces the earth & the dark half of the moon is not visible | new moon is when the moon cannot be seen |
new moon is when the moon cannot be seen & a new moon is a kind of phase of the moon & a student cannot observe the moon in the clear night sky on feburary 21 | the student observes a new moon phase on feburary 21 |
the student observes a new moon phase on feburary 21 & a moon phase occurs 28 days after the last time it occurred | the next new moon will occur 28 days after feburary 21 |
the next new moon will occur 28 days after feburary 21 & 28 days after feburary 21 is march 21 | the next new moon will occur on march 21 |
the moon revolving around / orbiting the earth causes the phases of the moon & the moon orbiting the earth occurs once per month | each of the moon 's phases of earth's moon occurs once per month |
the earth revolves around the sun & a revolution occurs when something revolves around something else | revolution can be used to describe the earth revolving around the sun |
gravity causes orbits & planets in the solar system orbit the sun | gravity causes the planets in the solar system to orbit the sun |
gravity causes orbits & planets in the solar system orbit the sun | gravity causes the planets in the solar system to orbit the sun |
mars is a kind of planet & mars is located in the solar system | mars is a planet in the solar system |
gravity causes the planets in the solar system to orbit the sun & mars is a planet in the solar system | gravity causes mars to orbit around the sun |
gravity causes orbits & the earth revolves around the sun | gravity causes the earth to revolve around the sun |
gravity causes orbits & the moon orbits the earth | gravity causes the moon to orbit the earth |
gravity causes the earth to revolve around the sun & gravity causes the moon to orbit the earth | gravity causes both the orbit of the earth around the sun and the orbit of the moon around the earth |
gravity causes orbits & planets in the solar system orbit the sun | gravity causes planets in the solar system to orbit the sun |
planets in the solar system orbit the sun & gravity causes orbits | gravity causes planets in the solar system to orbit the sun |
planets in the solar system orbit the sun & gravity causes orbits | gravity causes planets in the solar system to orbit the sun |
gravity causes orbits & the moon orbits the earth | gravity causes the moon to orbit around the earth |
planets in the solar system orbit the sun & gravity causes orbits | gravity causes the planets in the solar system to orbit the sun |
uranus is located in the solar system & uranus is a kind of planet | uranus is a planet located in the solar system |
uranus is a planet located in the solar system & planets in the solar system orbit the sun | uranus is a planet in the solar system that orbits around the sun |
uranus is a planet in the solar system that orbits around the sun & gravity causes orbits | gravity causes uranus to orbit around the sun |
the moon orbiting the earth occurs once per month & the moon 's orbit is elliptical | the moon orbits the earth in an elliptical orbit once per month |
planetary orbits are mostly elliptical & planets in the solar system orbit the sun | planets in the solar system orbit the sun in an elliptical orbit |
a planet is a kind of celestial object / body & earth is a kind of planet | earth is a kind of celestial object |
earth is a kind of celestial object & as distance from an object decreases , that object will appear larger & a star is a kind of celestial object / celestial body | as the distance from a star to earth decreases, the star will appear larger |
as the distance from a star to earth decreases, the star will appear larger & the sun is the star that is closest to earth | the sun will appear larger than other stars because it is the closest star to earth |
dehydrating food is used for preserving food & astronauts require preserved food for extended flights | dehydrating food can be used for preserving food for extended flights |
a space probe can orbit / land on other planets & mars is a kind of planet | a space probe can land on mars |
a space probe can land on mars & a space probe is used for collecting / analyzing materials / samples / information | a space probe can land on mars and collect and analyze samples |
a space probe can land on mars and collect and analyze samples & the viking i lander was sent to mars and analyze atmospheric gases and soil samples | the viking i lander is a kind of space probe |
high tide is a stage in the tide cycle process & low tide is a stage in the tide cycle process & the tide cycle occurs regularly twice per day | high tide and low tide in the tide cycle occur twice per day |
high tide and low tide in the tide cycle occur twice per day & a tide is a kind of natural event | high tide and low tide in the tidy cycle are the natural event that occur twice per day |
high tide is a stage in the tide cycle process & low tide is a stage in the tide cycle process & the tide cycle occurs regularly twice per day | high tide and low tide in the tide cycle occur twice per day |
the tide is when ocean levels periodically rise / fall & the gravitational pull of the moon on earth 's oceans causes the tides | the gravitational pull causes the ocean levels on earth to rise and fall periodically |
the tide is when ocean levels periodically rise / fall & the gravitational pull of the moon on earth 's oceans causes the tides | the gravitational pull causes the ocean levels on earth to rise and fall periodically |
the moon moves away from earth & moving away from the source increases the distance | the moon moving away from earth increases the distance between the moon and the earth |
the moon moving away from earth increases the distance between the moon and the earth & as the distance from an object increases , the force of gravity on that object will decrease | the moon moving away from earth causes the force of gravity of moon on earth decreases |
the moon moving away from earth causes the force of gravity of moon on earth decreases & as the gravitational pull of the moon decreases , the height of ocean tides will decrease | the moon moving away from earth causes the height of ocean tides on earth to decrease |
spring tides occur during a full moon & spring tide is when the distance between high tide and low tide is the greatest | the highest tides occur during a full moon |
the sun is a source of light / light energy called sunlight & as a source of light moves directly overhead of an object , the size of the shadow of that object will decrease | when the sun moves directly overhead of an object, the size of the shadow of that object will be the smallest |
when the sun moves directly overhead of an object, the size of the shadow of that object will be the smallest & the sun is located directly overhead at noon | the shadows of an object at noon will be the smallest |
the shadows of an object at noon will be the smallest & a flagpole is a kind of object | the shadow of a flagpole will be the smallest at noon |
volcano eruption is when volcano deposits lava to the earth 's surface & new land can be formed by lava cooling after an volcano eruption | volcano eruption can form a new land |
volcano eruption can form a new land & a volcanic eruption is a kind of quick process | volcano eruption is a quick process to form land |
most canyons are formed by flowing rivers & a valley is formed by flowing rivers | canyons and valleys are formed by flowing rivers |
sometimes piles of rocks are formed by melting glaciers depositing rocks & deposition is a kind of constructive force | piles of rocks are formed by the constructive force of glaciers |
water deposits the leaves at the foot of the hill and fans out & a delta is formed by sediment depositing at the mouth of a river by water fanning out | water depositing leaves at the foot of the hill is similar to water forming a delta |
a river is a kind of a moving body of water & most canyons are formed by flowing rivers through erosion over long periods of time | most canyons are formed by moving body of water through erosion over long periods of time |
the grand canyon is a kind of canyon & most canyons are formed by flowing rivers through erosion over long periods of time | the grand canyon is formed by flowing rivers through erosion over long periods of time |
a river is a kind of flowing body of water & the colorado river is a kind of river next to the grand canyon | the colorado river is a flowing river next to the grand canyon |
the grand canyon is formed by flowing rivers through erosion over long periods of time & the colorado river is a flowing river next to the grand canyon | the grand canyon was formed by the flowing colorado river over long periods of time |
the grand canyon was formed by the flowing colorado river over long periods of time & if something is formed by something else, then that something else is required by that something | forming the grand canyon requires the flowing colorado river |
forming the grand canyon requires the flowing colorado river & if something requires something else then that something else is important to that something | the flowing colorado river is important for forming the grand canyon |
a river is a kind of flowing body of water & the colorado river is a kind of river | the colorado river is a flowing body of water |
the flowing colorado river is important for forming the grand canyon & the colorado river is a flowing body of water | a flowing body of water is important for forming the grand canyon |
a dinosaur is a kind of extinct animal & a bone is a part of some animals & an example of a fossil is the bones of an extinct animal | the bones of dinosaurs are an example of fossils |
the bones of dinosaurs are an example of fossils & index fossils can be used to determine the approximate age of other fossils in that area | index fossils can be used to determine the approximate age of the fossils of the bones of dinosaurs |
if a species existed for a relatively short time then that species is now extinct & index fossils are formed from species that existed for a relatively short time | the species that form the index fossils are now extinct |
shell is a part of a mussel & a freshwater mussel is a kind of mussel | shell is a part of a freshwater mussel |
shell is a part of a freshwater mussel & fossils of shells of freshwater mussels are found in a mountain range | fossils of freshwater mussels are found in the mountain range |
fossils of freshwater mussels are found in the mountain range & if fossils of a water animal or plant are found in a place then that animal or plant used to live in that place & a mountain range is a kind of place & a mussel is a kind of water animal | the freshwater mussels used to live in the place where the mountain range is located |
a freshwater mussel is a mussel lives in freshwater & a mussel is a kind of water animal | a freshwater mussel is a kind of water animal that lives in freshwater |
the freshwater mussels used to live in the place where the mountain range is located & a freshwater mussel is a kind of water animal that lives in freshwater | the mountain range used to be covered by freshwater |
the mountain range used to be covered by freshwater & a river usually contains freshwater | the mountain range was likely to be covered by a river |
an ocean is a kind of body of water & a body of water is a kind of environment | an ocean is a kind of environment |
an ocean is a kind of environment & a tropical environment usually has warm temperatures | a tropical ocean usually has warm temperatures |
a tropical ocean usually has warm temperatures & coral lives in tropical oceans | coral lives in warm oceans |
coral lives in warm oceans & coral is a kind of aquatic animal | corals are aquatic animals that live in warm oceans |
corals are aquatic animals that live in warm oceans & an ocean is a kind of body of water & if fossils of an aquatic animal or plant are found in a place then that place used to be covered by water in the past | if fossils of corals are found in a place then that place used to be covered by warm oceans in the past |
if fossils of corals are found in a place then that place used to be covered by warm oceans in the past & fossils of corals are found in ohio | ohio used to be covered in warm oceans in the past |
a wooded area is a kind of place & if fossils of a water animal or plant are found in a place then that place used to be covered by water in the past & fossils of seashells are found in a wooded area | the wooded area used to be covered by water in the past |
the wooded area used to be covered by water in the past & if something used to be in the past then that something has changed | the place has changed from being covered by water to a wooded area |
a dinosaur is a kind of reptile & a reptile is a kind of animal | a dinosaur is a kind of animal |
a dinosaur is a kind of animal & if fossils of an animal or plant are found in a place then that animal or plant used to live in that place & fossils of dinosaurs are found in antarctica | dinosaurs used to live in antarctica |
a dinosaur is a kind of reptile & a reptile is cold-blooded | dinosaurs are cold-blooded |
a dinosaur is a kind of animal & dinosaurs are cold-blooded | dinosaurs are cold-blooded animals |
dinosaurs are cold-blooded animals & cold-blooded animals cannot live in cold environments | dinosaurs cannot live in cold environments |
dinosaurs used to live in antarctica & dinosaurs cannot live in cold environments | antarctica was not a cold environment when dinosaurs used to live in antarctica |
a shark is a kind of fish & a fish is a kind of aquatic animal | a shark is a kind of aquatic animal |
a shark is a kind of aquatic animal & if fossils of an aquatic animal or plant are found in a place then that place used to be covered by water in the past | if fossils of sharks are found in a place then that place used to be covered by water in the past |
if fossils of sharks are found in a place then that place used to be covered by water in the past & sharks live in oceans & an ocean is a kind of body of water | if fossils of sharks are found in a place then that place used to be covered by oceans in the past |
if fossils of sharks are found in a place then that place used to be covered by oceans in the past & fossils of sharks are found on top of a mountain & the top of a mountain is a kind of place | the mountain used to be covered by oceans in the past |
marine animals are water animals & marine fossils means fossils of marine animals | marine fossils are fossils of water animals |
marine fossils are fossils of water animals & marine fossils are found in mountains | fossils of water animals are found in mountains |
fossils of water animals are found in mountains & if fossils of a water animal or plant are found in a place then that place used to be covered by water in the past | the mountains used to be covered by water in the past |
the mountains used to be covered by water in the past & if something used to be in the past then that something has changed & a mountain is a kind of environment & a body of water is a kind of environment | the environment has changed from a body of water to mountains |
the environment has changed from a body of water to mountains & environments are found on the crustal surface of earth | the environments on the crustal surface of earth have changed from a body of water to mountains |
limestone is a kind of sedimentary rock & shale is a kind of sedimentary rock | shale and limestone are different kinds of sedimentary rock |
shale and limestone are different kinds of sedimentary rock & environments changing can cause layers of rock that are on top of each other to be of different kind & a layer of shale is on top of a layer of limestone | environments changing causes the shale and limestone to be on top of each other |