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In this activity, learners build a recording timer made from simple materials (e.g., small dc motor, sharpie pen, craft sticks, adding machine paper tape, etc.).

In this activity, learners will explore how a hydrometer works by building a working model and conducting experiments.

In this activity, learners use tsunami time travel maps to predict how long it will take a tsunami to reach the shore.

In this activity, learners use basic measurements of the Earth and pieces of rock and iron to estimate the mass of the Earth.