Twice a day, the sea washes on to the shore at high tide. Then it flows back out again at low tide. The tides are caused by the Moon and Sun pulling the sea into giant bulges on either side of the Earth.
Amazing! If all the coasts were straightened out, they’d stretch round the Earth 13 times. At 90,000 kilometres, Canada has the longest coast.
Why are beaches sandy?
Sand is made from tiny fragments of rock and shells, crushed up by the wind and water. Sand is usually yellow or white. But some sand is black because it contains volcanic rock or coal.
How are cliffs carved out?
Along the coast, the rocks are worn away by the force of the waves. As the waves crash against the shore, they carve out cliffs, caves and high arches. Sometimes an arch collapses, leaving a stack, or pillar, of rock.
Is it true? White horses swim in the sea.
Yes. But they’re not real horses. They’re the white, foamy tops of the waves as they gallop towards the shore.
Picture Credit : Google