Tides and shores Oceans
+Nipam Patel+NIPAM PATEL
The sea level rises and falls twice each day along the coast.
(At high tide, the sea rises up the shore and dumps seaweed, shells and drift wood. Most coasts have two high tides and two low tides every day)
(High tides happen at the same time each day on opposite sides of the Earth)
This is known as high and low tides. Tides happen because of the pull of the Moon, which lifts water from the part of the Earth’s surface facing it.
Spring tides are especially high.
They occur twice a month, when the Moon is in line with the Earth and the Sun.
Then, the Sun’s pulling force joins the Moon’s and seawater is lifted higher than usual.
The opposite happens when the Moon and Sun are at right angles to the Earth.
Then, their pulling powers work against each other causing weak neap tides — the owest high tides and low tides.
(4 Neap tides occur when the Sun and Moon are at right angles to each other and pulling in different directions)
(Spring tides occur when the Sun and the Moon are lined up and pulling together)
The sea is strong enough to carve into rock.
(Waves can create amazing shapes such as pillars called Sea stacks)
Pounding waves batter coastlines and erode, or wear away, the rock.
Tidal waves are the most powerful waves.
(A tsunami can travel faster than a jumbo Jet)
Also known as tsunamis, they happen when underwater earthquakes trigger tremendous shock waves. These whip up a wall of water that travels across the sea’s surface.
Sand is found on bars and spits, as well as beaches.
It is made up of grains of worn-down rock and shell. Sand collects on shorelines and spits, but also forms on offshore beaches called sand bars. Spits are narrow ridges of worn sand and pebbles.
( The stilt-like roofs mangrove trees take in both and wafer)
Some shores are swampy.
This makes the border between land and sea hard to pinpoint. Muddy coastlines include tropical mangrove swamps that are flooded by salty water from the sea.
AMAZING FACT
The biggest tsunami was taller than five Statues of Liberty it hit the Japanese Ryuku islands in 1771.
Tides and shores Oceans
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