The Great Lakes of North America represent the largest source of freshwater on the planet. Approximately how many years ago did the Great Lakes form?

All of the following characteristics apply to the riparian zone except __________.

Freshwater is a necessary resource for human survival. Approximately what percent of the Earth's water supply is found in freshwater resources that are groundwater deposits (i.e. rivers, lakes, and streams)?

About 2% of the Earth's water supply is suitable for human and plant consumption. 98% of Earth's water is found in the oceans and is too salty for human or plant consumption.

Where is a majority of Earth's fresh water found?

What percent of the Earth's water is readily available for drinking and agriculture?