15. What controls the length of a day?
A. The amount of time it takes Earth to complete a turn on its axis
B. The amount of time it takes the sun to complete a turn on its axis
C. The amount of time it takes Earth to complete an orbit around the sun
D. The amount of time it takes the moon to complete an orbit around Earth
16. Which factor makes Earth different from all the other planets in the solar system in its ability
support life?
A. Earth's tilt
C. Earth's revolution
B. Earth's rotation
D. The Earth has a breathable atmosphere
17. What is Earth's rotation?
1. When Earth spins around on its axis for twenty-four hours
B. When Earth spirs around on its axis for thirty-six hours
C. When Earth revolves around the sun for 365 days
D. When Earth revolves around Mars for thirty days
18. What is happening when you have daylight?
A. Your part of the Earth is facing away from the sun
B. Your part of the Earth is facing towards the sun
C. The moon is moving towards the Earth.
D. The sun is moving towards the Earth.
19. What makes a moving object to continue moving in a straight line or a stationary object to remain
in a place?
A. Gravity
B. Mass
C. Inertia
D. Speed
20. Which of the following does NOT explain why it is always warm at the Equator?
A. It is closer to the sun than the poles
B. The atmosphere is thicker around the Equator
C. The earth's atmosphere flattens slightly over the Equator
D. The Equator gets hit with a high angle of radiation from the sun​