Question

1. the ______ is the main source of water for the water cycle.
2. the ______ is the main energy source for the water cycle.

Explanation:

1. For question 14: The largest reservoir of water that feeds the water cycle is the ocean, as it holds over 96% of Earth's water and is the primary source for evaporation in the cycle.
2. For question 15: The Sun provides the heat energy that drives evaporation, the key initial step of the water cycle, making it the main energy source.

Answer:

1. ocean
2. Sun