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Maddie's Do You Know? - Season 4 - Episode 8 - Floating and Sand

Today, Maddie’s at sea! First she visits a boating lake, using her special underwater cameras to find out how the hull of a boat is shaped to help it float on water. She learns how even big heavy things can float because of a force called buoyancy.
Next, Maddie heads to a beach to discover how sand is made. She explains how a process called weathering breaks the rocks down to small pieces and how all the tiny grains of rock make sand. She then uses a special microscope camera to see how thousands of bits of different minerals like quartz make up sand.
Also known as: 麦迪告诉你, 麦迪的你知道吗?
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