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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 rub rocks and shells against each other for a very long time. Bit by bit they break into the soft sand you dig your toes into.

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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. The longest beach in the world stretches for more than 200 kilometres. The longest beach in the world stretches for more than 200 kilometres.