Crabs can walk sideways along the beach.
A crab's legs bend in a way that makes moving sideways easy. It can scuttle left or right very quickly to hide.
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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.
A sandcastle holds together better when the sand is a little wet.
Seashells were once the homes of small sea animals.
The longest beach in the world stretches for more than 200 kilometres.