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The tallest sandcastle ever built was about 21 metres high.

The tallest sandcastle ever built was about 21 metres high.

Built in Germany, it was taller than three houses stacked up. It took lots of people and tonnes of sand to make.

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Sand is made of tiny bits of rock and shell worn down by the sea. Sand is made of tiny bits of rock and shell worn down by the sea. Waves are made by the wind blowing across the water. Waves are made by the wind blowing across the water. A sandcastle holds together better when the sand is a little wet. A sandcastle holds together better when the sand is a little wet. Seashells were once the homes of small sea animals. Seashells were once the homes of small sea animals. Crabs can walk sideways along the beach. Crabs can walk sideways along the beach.