sentences
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a computer is used for communication / finding information
| 1
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getting information sometimes requires observing / observation
| 1
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a telescope is used for observing stars by astronomers
| 1
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a moon is a kind of celestial object / celestial body
| 1
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detailed observation of celestial objects requires a telescope
| 1
|
a planet is a kind of celestial object / celestial body
| 1
|
a star is a kind of celestial object / celestial body
| 1
|
as distance to a city decreases , the amount of light pollution will increase
| 1
|
as light pollution increases , seeing the stars will be harder
| 1
|
a telescope is used for observing stars
| 1
|
making discoveries requires observing
| 1
|
a telescope is used for observing the sky by astronomers
| 1
|
using a telescope to photograph solar events requires a light filter
| 1
|
a solar flare is a kind of solar event
| 1
|
a solar prominence is a kind of solar event
| 1
|
venus has moon-like phases
| 1
|
a telescope is used for observing planets
| 1
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venus is a kind of planet
| 1
|
an optical telescope requires visible light for human to use
| 1
|
radio telescopes can see through clouds and dust
| 1
|
clouds / dusts block visible light
| 1
|
detailed observation of celestial objects requires a telescope
| 1
|
if something is required for something else then that something allows that something else
| 1
|
a planet is a kind of celestial object / celestial body
| 1
|
a moon phase occurs 28 days after the last time it occurred
| 1
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a full moon is a kind of phase of the moon
| 1
|
1 month is equal to 28-31 days
| 1
|
the new moon is when the dark half of the moon faces the earth
| 1
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a new moon is a kind of phase of the moon
| 1
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the new moon is when the lighted half of the moon faces the sun
| 1
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each of the moon 's phases occurs once per month
| 1
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a full moon is a kind of phase of the moon
| 1
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a new moon is a kind of phase of the moon
| 1
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a student cannot observe the moon in the clear night sky on feburary 21
| 1
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a moon phase occurs 28 days after the last time it occurred
| 1
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the new moon is when the dark half of the moon faces the earth
| 1
|
the dark half of the moon is not visible
| 1
|
28 days after feburary 21 is march 21
| 1
|
the moon revolving around / orbiting the earth causes the phases of the moon
| 1
|
the moon orbiting the earth occurs once per month
| 1
|
the earth revolves around the sun
| 1
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a revolution occurs when something revolves around something else
| 1
|
gravity causes orbits
| 1
|
planets in the solar system orbit the sun
| 1
|
gravity causes orbits
| 1
|
mars is a kind of planet
| 1
|
planets in the solar system orbit the sun
| 1
|
mars is located in the solar system
| 1
|
gravity causes orbits
| 1
|
the earth revolves around the sun
| 1
|
the moon orbits the earth
| 1
|
gravity causes orbits
| 1
|
planets in the solar system orbit the sun
| 1
|
planets in the solar system orbit the sun
| 1
|
gravity causes orbits
| 1
|
planets in the solar system orbit the sun
| 1
|
gravity causes orbits
| 1
|
gravity causes orbits
| 1
|
the moon orbits the earth
| 1
|
planets in the solar system orbit the sun
| 1
|
gravity causes orbits
| 1
|
uranus is located in the solar system
| 1
|
gravity causes orbits
| 1
|
planets in the solar system orbit the sun
| 1
|
uranus is a kind of planet
| 1
|
the moon orbiting the earth occurs once per month
| 1
|
the moon 's orbit is elliptical
| 1
|
planetary orbits are mostly elliptical
| 1
|
planets in the solar system orbit the sun
| 1
|
a planet is a kind of celestial object / body
| 1
|
as distance from an object decreases , that object will appear larger
| 1
|
earth is a kind of planet
| 1
|
a star is a kind of celestial object / celestial body
| 1
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the sun is the star that is closest to earth
| 1
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dehydrating food is used for preserving food
| 1
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astronauts require preserved food for extended flights
| 1
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a space probe can orbit / land on other planets
| 1
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a space probe is used for collecting / analyzing materials / samples / information
| 1
|
the viking i lander was sent to mars and analyze atmospheric gases and soil samples
| 1
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mars is a kind of planet
| 1
|
high tide is a stage in the tide cycle process
| 1
|
a tide is a kind of natural event
| 1
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low tide is a stage in the tide cycle process
| 1
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the tide cycle occurs regularly twice per day
| 1
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high tide is a stage in the tide cycle process
| 1
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low tide is a stage in the tide cycle process
| 1
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the tide cycle occurs regularly twice per day
| 1
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the tide is when ocean levels periodically rise / fall
| 1
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the gravitational pull of the moon on earth 's oceans causes the tides
| 1
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the tide is when ocean levels periodically rise / fall
| 1
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the gravitational pull of the moon on earth 's oceans causes the tides
| 1
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the moon moves away from earth
| 1
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moving away from the source increases the distance
| 1
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as the gravitational pull of the moon decreases , the height of ocean tides will decrease
| 1
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as the distance from an object increases , the force of gravity on that object will decrease
| 1
|
spring tides occur during a full moon
| 1
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spring tide is when the distance between high tide and low tide is the greatest
| 1
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the sun is located directly overhead at noon
| 1
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the sun is a source of light / light energy called sunlight
| 1
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as a source of light moves directly overhead of an object , the size of the shadow of that object will decrease
| 1
|
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