GEOLOGY

Detailed explanation-1: -However, it is a limited resource; freshwater makes up only about three percent of all water on Earth. Although freshwater is considered a renewable resource, the use of freshwater in some regions exceeds the ability of natural processes to replenish supplies.

Detailed explanation-2: -Fresh water is vital to life and yet it is a finite resource. Of all the water on Earth, just 3% is fresh water. Although critical to natural and human communities, fresh water is threatened by a myriad of forces including overdevelopment, polluted runoff and global warming.

Detailed explanation-3: -Rain and other forms of precipitation fall on our planet as slightly acidic fresh water. As some of this water washes over the landscape, it physically erodes rocks and chemically breaks them down. It then carries salts from the rocks into rivers and other streams and deposits the salts in the ocean.

Detailed explanation-4: -Freshwater and saltwater. Freshwater is defined as having a low salt concentration-usually less than 1%. Plants and animals in freshwater regions are adjusted to the low salt content and would not be able to survive in areas of high salt concentration (i.e., ocean). There are different types of freshwater regions.