8 Astronomy Ch 1 Complete

1) Earth’s rotation takes about

• 365 days
• 6 months
• 24 hours
• 1 month

2) Day and night are caused by

• the tilt of Earth’s axis.
• eclipses.
• Earth’s revolution around the sun.
• Earth’s rotation on its axis.

3) One complete revolution of Earth around the sun takes about

• one rotation.
• one year.
• one season.
• one eclipse.

6) Earth has seasons because

• it rotates on its axis.
• the distance between Earth and the sun changes.
• its axis is tilted as it moves around the sun.
• the temperature of the sun changes.

7) When the north end of Earth’s axis is tilted toward the sun, North America will experience

• more indirect rays and shorter days.
• more indirect rays and longer days.
• more direct rays and longer days.
• more direct rays and shorter days.

8) In the Southern Hemisphere, the summer solstice occurs when the sun is

• at the equator.
• farthest south.
• closest to Earth.
• farthest north.

9) An equinox occurs when

• neither end of Earth’s axis is tilted toward/away from sun.
• the north end of Earth’s axis is tilted away from the sun.
• Earth’s axis is parallel to the sun’s rays.
• the north end of Earth’s axis is tilted toward the sun.

1) All objects are attracted to each other by the force of

• weight.
• mass.
• gravity.
• inertia.

2) The strength of the force of gravity depends on

• the masses of the objects and the distance between them.
• the masses of the objects and their speeds.
• the weight of the objects and their speeds.
• the masses of the objects and their weights.

3) The tendency of a moving object to continue moving in a straight line is called

• orbital speed.
• mass.
• gravity.
• inertia.