An ocean is a major body An ocean is a major body of saline water, and a principal of saline water, and a principal component of the hydrosphere. component of the hydrosphere.

Approximately 71% of Approximately 71% of the Earth's surface is covered the Earth's surface is covered

by oceanby ocean.. 29%

71%

oceansland

The ocean has a important The ocean has a important effect on the biosphere. effect on the biosphere.

Oceanic evaporation as a phase Oceanic evaporation as a phase of the water cycle is source of of the water cycle is source of

rainfall and ocean temperatures rainfall and ocean temperatures define climate and wind. Life define climate and wind. Life

inside the ocean was evolved 3 inside the ocean was evolved 3 billion years before life on the billion years before life on the

ground.ground. Water depth and Water depth and distance from coast have big distance from coast have big effect on shoal and kinds of effect on shoal and kinds of plants and animals who live plants and animals who live

there.there.

Ocean currents is manipulated to Ocean currents is manipulated to the world weather. Currents are the world weather. Currents are

turned around and carry warm and turned around and carry warm and cold weather. Cold is come from cold weather. Cold is come from poles and warmth is come from poles and warmth is come from

equator. Most famous current is the equator. Most famous current is the Gulf Stream The Gulf Stream Gulf Stream The Gulf Stream surface current is a western surface current is a western boundary current, one of the boundary current, one of the

strongest-warm, deep, fast, and strongest-warm, deep, fast, and relatively salty. It separates open-relatively salty. It separates open-ocean water from coastal waterocean water from coastal water

People are fished in the People are fished in the oceans by large nets. Nets oceans by large nets. Nets

are hunged on the big are hunged on the big fishing boats. Fishing boats fishing boats. Fishing boats caught milcaught milllionionss tune of fish tune of fish

every year.every year.

Giant tankers are transported Giant tankers are transported oil through the oceans. This oil through the oceans. This

form of transport is dangerous form of transport is dangerous for life in oceans. In years 1970 for life in oceans. In years 1970 till 1985 was 185 big accident. till 1985 was 185 big accident. In this accident escaped 1300 In this accident escaped 1300 ton of oil. In 1989, 39 000 ton ton of oil. In 1989, 39 000 ton of oil was escaped from tanker of oil was escaped from tanker Exxon and oil was covered area Exxon and oil was covered area

4200 km². But oil is escaped 4200 km². But oil is escaped during normal transports too.during normal transports too.

8.June – World's ocean day8.June – World's ocean day

World ocean is covered by World ocean is covered by four oceans:four oceans:

• Pacific oceanPacific ocean((The pacific ocean is the largest of the Earth's The pacific ocean is the largest of the Earth's

oceans.oceans.))• Atlantic oceanAtlantic ocean

(The Atlantic ocean is most exploited ocean.)(The Atlantic ocean is most exploited ocean.)

• Indian oceanIndian ocean(The Indian ocean is the saltiest ocean on the world)(The Indian ocean is the saltiest ocean on the world)

• Southern oceanSouthern ocean(The Southern ocean is least salty and cold ocean of (The Southern ocean is least salty and cold ocean of

all oceans.)all oceans.)

Specifications about world Specifications about world ocean:ocean:

• World ocean have an area about 361 World ocean have an area about 361 million km².million km².

• These ocean have capacity about These ocean have capacity about 1 370 million km³ too.1 370 million km³ too.

• It have medial depth 3 790 m.It have medial depth 3 790 m.

Róbert OndicaRóbert Ondica8.A8.A

Zdroje: InternetZdroje: Internet