1. Why do plains usually extend out from the base of a mountain? 2. (a) Where is most of Earth’s water? What percentage of it resides there? (b) Where is most of Earth’s fresh water? 3. (a) Describe...

1. Why do plains usually extend out from the base of a mountain?

2. (a) Where is most of Earth’s water? What percentage of it resides there? (b) Where is most of Earth’s fresh water?

3. (a) Describe the hydrologic cycle. (b) What part of the hydrologic cycle has particular relevance to the shaping of Earth’s landforms?