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Many people get water from a source deep underground, called groundwater.

An estuary is a body of water that is created when freshwater from rivers and streams flows into the saltwater of an ocean.

In this ecology activity (page 8 of the PDF), learners explore how to filter contaminated water using a variety of materials.

Where rainwater goes after the rain stops? And why there are rivers and lakes in some parts of the land but not in others?

Bones are stiff, which helps us lift heavy things and walk around, but they are also somewhat flexible, which lets them bend slightly.

In the wild, small crustaceans known as brine shrimp live in marine habitats such as saltwater lakes.