Answer:
The main difference between week 1 and week 3 of the moon's cycle is that week 3's moon develops into a waning crescent, while week 1's moon develops from a waxing crescent.
Explanation:
A waning crescent is the crescent of the moon cycle that is on the left side of the moon. A waxing crescent is the crescent of the moon cycle that is on the right side of the moon. In week 1, the moon cycle begins as a waxing crescent. In week 3, the moon cycle ends at a waning crescent.
