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

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

When it rains, water can collect on top of and seep into the ground. Water can also run downhill, carrying soil and pollution with it.

How do scientists measure how clear or murky water in a lake is? How does water clarity (clearness) affect what lives in the lake?