16.The apparent changes in the moon is called?
A. an orbit B. a crater C. a phase D. a satellite
17.About how many days does it take the moon to go through its cycle?
A. 5 B. 10 C. 24 D. 29 ½
18.When the part of the moon that you can see is slowly getting bigger or growing, it is?
A. Full B. New C. Waning D. Waxing
19.When the part of the moon that you can see appears to be shrinking or decreasing, it's is?
A. Full B. New C. Waning D. Waxing
20.The only natural satellite that earth has.
A. moon B. mountain C. star D. Sun​