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In this activity, learners use multiple thermometers, placed at different angles, and a lamp to investigate why some places on Earth's surface are much hotter than others.

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

In some parts of the world, lakes freeze during winter. In this activity learners will explore water’s unique properties of freezing and melting, and how these relate to density and temperature.

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