Essay About Seaside

Submarine earthquakes arising from tectonic plate movements under the oceans can lead to destructive tsunamis, as can volcanoes, huge landslides or the impact of large meteorites.

The sea, the world ocean or simply the ocean is the connected body of salty water that covers over 70% of Earth's surface (361,132,000 square kilometres (139,434,000 sq mi), with a total volume of roughly 1,332,000,000 cubic kilometres (320,000,000 cu mi)).Many of the major groups of organisms evolved in the sea and life may have started there.The sea provides substantial supplies of food for humans, mainly fish, but also shellfish, mammals and seaweed, whether caught by fishermen or farmed underwater.Winds blowing over the surface of the sea produce waves, which break when they enter shallow water.Winds also create surface currents through friction, setting up slow but stable circulations of water throughout the oceans.Tides, the generally twice-daily rise and fall of sea levels, are caused by Earth's rotation and the gravitational effects of the orbiting Moon and, to a lesser extent, of the Sun.Tides may have a very high range in bays or estuaries.It moderates Earth's climate and has important roles in the water cycle, carbon cycle, and nitrogen cycle.It has been travelled and explored since ancient times, while the scientific study of the sea—oceanography—dates broadly from the voyages of Captain James Cook to explore the Pacific Ocean between 17.Sea temperature depends on the amount of solar radiation falling on its surface.In the tropics, with the sun nearly overhead, the temperature of the surface layers can rise to over 30 °C (86 °F) while near the poles the temperature in equilibrium with the sea ice is about −2 °C (28 °F).

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