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16 Cards in this Set
- Front
- Back
The force of attraction between any two objects
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gravity
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The strength of gravity increases as the BLANK of objects increases and decreases as the distance between objects increases
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mass
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the sun's gravitational pull on the Earth is BLANK than it's pull on a planet much farther away, such as Neptune
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stronger
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a path that one object takes as it moves around another object is its
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orbit
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moving objects have the tendency to keep moving in a straight line; this is called
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inertia
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because of the effects of gravity and inertia, Earth moves in a nearly circular orbit shaped like an
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ellipse
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every year, Earth makes one complete trip around the Sun. This is called a.....
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revolution
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as Earth revolves around the Sun, sunlight strikes different parts of Earth at different
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angles
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Sunlight strikes Earth differently at different times of year because EArth's axis is...
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tilted
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Earth and the other planets move in orbits around the
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sun
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the changes in the angle of sunlight on Earth's surface cause the
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seasons
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when the northern hemisphere is tilted away from the sun, the season there is
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winter
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when it is winter in the northern hemisphere, it is BLANK in the southern Hemisphere
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summer
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the heat energy of sunlight is more concentrated in the summer because the hemisphere having summer is tilted BLANK the sun
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toward
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As Earth revolves around the Sun, it also BLANK on its axis
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rotates
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at any time, half of Earth faces the sun and has BLANK1 while the other half faces away and has BLANK2
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daylight, darkness
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