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28 Cards in this Set
- Front
- Back
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Sun |
the start at the center of our Solar System |
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moon |
MoonEarth's only natural satellite |
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Earth |
the third planet from the Sun
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Rotation |
to turn around a center point or axis (Earth spins around on its axis) |
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Revolution |
to move around another object (Earth goes around the Sun) |
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orbit |
the path followed by a planet, moon, or other heavenly body as it travels around another object |
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Gravity |
force pushing down on us on Earth; force of attraction between two objects that have mass |
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Atmosphere |
the layer of gases that surround the Earth |
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axis |
a real or imaginary straight line about which something turns |
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tilt |
to slant or tip |
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hemisphere |
one half of a sphere or globe |
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equator |
an imaginary line around the middle of the Earth, at an equal distance form the North Pole and the South Pole |
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solar eclipse |
s a type of eclipse that occurs when the Moon passes between the Sun and Earth, and the moon casts a shadow on Earth |
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lunar eclipse |
is a type of eclipse that occurs when the Moon passes directly behind the Earth and into its shadow |
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direct sunlight |
sunlight that travels in a straight path |
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indirect sunlight |
sunlight that is not direct or straight, it strikes Earth at an angle |
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solstice |
two days of the year when the Sun is farthest from the equator in the northern and southern hemispheres
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equinox |
two days of the year when the amount of day and night are of equal length all over the world |
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tides |
are the rise and fall of sea levels caused by the combined effects of the gravitational force exerted by the Moon and the Sun and the rotation of the Earth
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spring tide |
the exceptionally high and low tides that occur at the time of the new moon or full moon lunar phases |
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neap tide |
occurs when the difference between the high and low tides is the least, lowest level of high tide; these tides occur during the first and third quarter phases of the moon |
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new moon |
moon phase during which the side facing the Earth cannot be seen because it is not illuminated by the Sun |
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full moon |
moon phase when the entire side facing Earth is illuminated by the Sun |
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crescent |
moon phase during which less than half of the side facing the Earth is illuminated |
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gibbous |
moon phase during which more than half of the side facing the Earth is illuminated |
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waxing |
the illuminated surface of the Moon as seen from Earth is increasing in size |
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waning |
the illuminated surface of the Moon as seen from the Earth is decreasing in size |
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atmosphere |
the layer of gases that surround the Earth |
