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6th Grade Chapter 19
Earth, Moon, and Sun
Question | Answer |
---|---|
Earth's rotation | takes about 24 hours |
Earth's rotation on its axis | causes day and night |
Earth's revolution | takes about one year |
Earth has seasons | because it's axis it tilted as it moves around the sun |
Equinox | occurs when neither end of Earth's axis is tilted toward or away from the Sun |
Gravity | the force where all objects are attracted to each other |
Inertia | the tendency of a moving object to continue moving in a straight line or a stationary object to remain in place |
Two factors that combine to keep Earth and the moon in their orbits are | gravity and inertia |
The pull of gravity on the surface of the moon is | one sixth that of Earth |
The strength of the force of gravity depends on | the masses of the objects and the distance between them |
Solar Eclipse | the blocking of sunlight to Earth that occurs when the moon is directly between the Sun and the Earth |
Lunar Eclipse | the blocking of sunlight to the Moon that occurs when Earth is directly between the Sun and the Moon |
For a solar eclipse to occur | the moon must be directly between Earth and Sun |
A total solar eclipse is visible from | only within the moon's umbra |
During a full moon | a lunar eclipse can occur |
During a total lunar eclipse | the moon is in Earth's umbra |
When the north end of Earth's axis it tilted toward the sun | North America will experience more direct rays and longer days |
Because the moon rotates once for each revolution around the Earth, | you never see the far side of the moon from Earth |
You are less likely to see a total solar eclipse than a total lunar eclipse because | the moon's umbra only covers a small area on Earth's surface |
Maria | regions formed from huge lave flows on the moon's surface |
Craters | large round pits found on the moon's surface |
Moon's diameter | about one-fourth the diameter of Earth |
High tides | when the sun, Earth, and moon are nearly in a line |
Thrust | the reaction force that propels a rocket forward |
Space shuttle | can be used many times to carry astronauts into orbit |
Water may be found on the moon | near the poles |
the space race was between | the United States and the Soviet Union |
the goal of the Apollo program | to land astronauts on the moon |
the event that began the space race | the Soviet Union launched Sputnik I |
the Moon was formed | when a large object struck Earth, and ejected material from the collision combined |
the temperature of the moon's surface varies greatly form day to night | because the moon has no atmosphere |