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

Glare from the sun and ripples from the wind can make it hard to see what's below the surface of a body of water.

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

In this activity, learners make a model of a one-way heart valve to investigate how a heart controls the direction of blood flow.

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