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Chapter 7

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 Front Back 1. How long does it take for Earth to rotate once on its axis? 24 hours 1. What causes day and night? Earth's rotation on its axis 1. How long does one revolution of Earth around the sun take? one year 1. Why does Earth have seasons? its axis is tiled as it moves around the sun 1. What does the phase of the moon you see depend on? How much of the sunlit side of the moon phases Earth 1. In what order must the sun, moon and Earth lie for a solar eclipse to occur? The moon must be directly between Earth and the sun. 1. During which phase of the moon can a lunar eclipse occur? Full moon 1. What causes tides? differences in how much the moon pulls on different parts of Earth. What did Galileo note about the moon’s surface craters 1. How large is the moon compared to Earth? 1/4 the size 1. How do scientists think the moon was formed? a large object struck Earth and the leftover material came together to form the moon. 1. What two factors combine to keep the Earth and the moon in their orbits? gravity and inertia 1. It takes __________ for Earth to rotate one time. 24 hours 1. Earth’s rotation causes ___________. day and night 1. It takes __________ for the Earth to revolve around the sun. 365 1/4 days 1. The Earth rotates on its _____________. Axis 1. The moon’s path, or it’s _____________, travels around the Earth. orbit 1. The moon revolves around the Earth. It takes about ___________. one month 1. When the sun’s light is blocked by the moon it is a ___________ eclipse. solar 1. When the moon’s light is blocked by the Earth’s shadow it is a ____________ eclipse. lunar 1. How would Earth be different if it were not tilted on its axis? There would be no seasons and temperautes would be fairly constant year round. 1. What determines the strength of the force of gravity between two objects? The masses of the objects and the distance between them determine the strength of gravity. 1. Name and describe 3 features found on the moon’s surface. Maria - drak, flat areas Galileo thought were seas Craters - pits formed by meteoroids Highlands - Mountains
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