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16 Cards in this Set
- Front
- Back
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Moon Phases
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caused by the changing positions of the Earth, the sun, and the moon.
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First quarter
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about one week after a new moon, when right half of the moon is illuminated by the sun.
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Full moon
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The entire half of the moon facing the Earth is illuminated by the sun. The earth is between the moon and the sun.
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New moon
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The entire half of the moon facing the Earth is unlit by the sun. The moon is between the earth and the sun
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Third quarter moon
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When half of the left side of the moon is lit.
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High tide
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the tide at its highest level
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Low tide
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the tide at its lowest level
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Spring tide
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Occurs when the Sun, Earth, and Moon are in straight alignment. Causes the highest and the lowest tides.
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Neap tide
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Occurs when the Sun, Earth, and Moon are at right angles to each other.
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Tilt of the Earth
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23.5 degrees. Reason for the seasons.
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Solar eclipse
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the passing of the moon between Earth and the sun; during a solar eclipse, the shadow of the moon falls on Earth.
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Lunar eclipse
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the passing of the moon through the Earth's shadow at full moon
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Earth’s axis
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The imaginary line on which the Earth spins. Tilted 23.5 degrees.
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Fission Theory
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The Moon was once part of the Earth and somehow separated from the Earth early in the history of the Solar System. The present Pacific Ocean basin is the most popular site for the part of the Earth from which the Moon came.
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Colliding Planetesimals Theory
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The interaction of earth-orbiting and Sun-orbiting planetesimals (very large chunks of rocks like asteroids) early in the history of the Solar System led to their breakup. The Moon condensed from this debris.
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Ejected Ring Theory
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A planetesimal the size of Mars struck the earth, ejecting large volumes of matter. A disk of orbiting material was formed, and this matter eventually condensed to form the Moon in orbit around the Earth.
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