Engineering Chemistry

Approximately 97.5% of Earth's water is found in the oceans.

Still waters, like lakes and groundwater, tend to have a more consistent chemical composition compared to flowing waters like rivers.

Organic matter, such as decaying plants and animals, is the most common impurity found in river water.

Rainwater, before it touches the ground, is considered the purest form of natural water.

Polar ice caps and giant glaciers hold about 2.4% of Earth's water, locked up as ice.