THE WORK OF SEA
THE EARTH CHANGING FACE
|Groynes are built at many beach resorts to prevent the|
continual movement of sand by sea current.
Waves continually batter the shore. Large waves pick up sands and pebbles, and hurl them at cliff until the top collapses. Wave and tides can also move beach sand and gravel.
*WHAT ARE SPITS?
Waves and currents transport sand, gravels and pebbles along coast. In places where the coasts change direction, the worn sand and pebbles piles up in narrow ridges called spits.
*DOES THE SEA WEAR AWAY THE LAND?
Waves wear away soft rocks to form bays, while harder rocks on either sides form headlands. Parts of the coast of northeast England have been warn back by 5 kilometers in the lasts 2000 years.
Some spits join one headland to another. They are called baymouth bars, because they can cut bays from the sea, turning them into enclosed lagoons.
*WHAT IS BLOWHOLE?
Its is a hole in the rocks farmed above a sea cave. When waves enter the blowhole, sometimes causing spectacular blasts of water.
*WHAT ARE ARCHES AND STACKS?
|WAVE HOLLOW OUT ARCHES (ABOVE) IN ROCKY HEADLANDS,|
WHICH EVENTUALLY COLLAPSE INTO STACKS(BELOW)
Waves attack headlands from both sides, wearing away coves in the cliffs. Eventually a natural arch is formed when two caves meet. When the arch collapses, all that remains is an isolated rocks, called a stocks.