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6th Grade Chapter 19

Earth, Moon, and Sun

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
Created by: Mrs. Gordon