A sea is a large body of salt water that is surrounded in whole or in part by land. More broadly, "the sea" is the interconnected system of Earth's salty, oceanic waters—considered as one global ocean or as several principal oceanic divisions. The sea moderates Earth's climate and has important roles in the water cycle, carbon cycle, and nitrogen cycle. Although the sea has been traveled and explored since prehistory, the modern scientific study of the sea—oceanography—dates broadly to the British Challenger expedition of the 1870s. The sea is conventionally divided into up to five large oceanic sections—including the International Hydrographic Organization's four named oceans (the Atlantic, Pacific, Indian, and Arctic) and the Southern Ocean; smaller, second-order sections, such as the Mediterranean, are known as seas. Owing to the present state of continental drift, the Northern Hemisphere is now fairly equally divided between land and sea (a ratio of about 2:3) but the South is overwhelmingly oceanic (1:4.7). Salinity in the open ocean is generally in a narrow band around 3.5% by mass, although this can vary in more landlocked waters, near the mouths of large rivers, or at great depths. About 85% of the solids in the open sea are sodium chloride. Deep-sea currents are produced by differences in salinity and temperature. Surface currents are formed by the friction of waves produced by the wind and by tides, the changes in local sea level produced by the gravity of the Moon and Sun.
Sunset - Sunset on the Baltic
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Sunset

Added 5 days ago by Wiesia

151

Sunset - Sunset on the Baltic
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Sunset

Added 11 days ago by Wiesia

83

Landscape - colorful jigsaw puzzle
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Landscape

Added 12 days ago by andi

115

Landscape - colorful jigsaw puzzle
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Landscape

Added 12 days ago by andi

132

Landscape - colorful jigsaw puzzle
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Landscape

Added 12 days ago by andi

71

Fan - colorful jigsaw puzzle
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Fan

Added 12 days ago by andi

129

BAJKOWY VIEW - Summer, vacation, rest
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BAJKOWY VIEW

Added 2 weeks ago by ada

185

BAJKOWY VIEW - Summer, vacation, rest
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BAJKOWY VIEW

Added 2 weeks ago by ada

96

BAJKOWY VIEW - Summer, vacation, rest
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BAJKOWY VIEW

Added 2 weeks ago by ada

111

BAJKOWY VIEW - Summer, vacation, rest
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BAJKOWY VIEW

Added 2 weeks ago by ada

57

BAJKOWY VIEW - Summer, vacation, rest
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BAJKOWY VIEW

Added 2 weeks ago by ada

99

BAJKOWY VIEW - Summer, vacation, rest
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BAJKOWY VIEW

Added 2 weeks ago by ada

146

seaside landscape - seaside landscape, coast, islets, yachts
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seaside landscape

Added 2 weeks ago by sandra

281 1

Sailboat on the lake. - Sailboat on the lake.
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Sailboat on the lake.

Added 3 weeks ago by Zeta

94

Antigua. Caribbean. - Beach on the Caribbean island of Antigua.
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Antigua. Caribbean.

Added 3 weeks ago by Zeta

80

Stone coast in England. - Stone coast in England.
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Stone coast in England.

Added 3 weeks ago by Zeta

91

The coast of England. - The coast of England. Cliffs in Dorset.
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The coast of England.

Added 3 weeks ago by Zeta

42

Rest in the Philippines. - Rest in the Philippines.
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Rest in the Philippines.

Added 3 weeks ago by Zeta

175

Krk island in Croatia. - Krk island in Croatia.
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Krk island in Croatia.

Added 3 weeks ago by Zeta

55

Summer by the sea. - Summer over the tropical sea.
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Summer by the sea.

Added 3 weeks ago by Zeta

67

Holiday in Andalusia - The most populated and the second in terms of area autonomous community located in southern Spain, c
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Holiday in Andalusia

Added 3 weeks ago by Adrian

236 1

Colorful puzzle - colorful puzzle jigsaw
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Colorful puzzle

Added 3 weeks ago by andi

39

Cabin for changing. - Cabin for changing by the sea.
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Cabin for changing.

Added 4 weeks ago by Zeta

46

Hammock in the sea. - Hammock in the sea in the tropics.
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Hammock in the sea.

Added 4 weeks ago by Zeta

35

House on the island. - House on the island. Cartagena. Columbia.
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House on the island.

Added 4 weeks ago by Zeta

122

Beach in Panama. - Isla Diablo San Blas. Panama.
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Beach in Panama.

Added 4 weeks ago by Zeta

63

Cliffs on Corfu. - Cliffs of the Ionian Sea in Corfu.
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Cliffs on Corfu.

Added 4 weeks ago by Zeta

81

Pier facing the sea. - Pier facing the sea.
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Pier facing the sea.

Added 4 weeks ago by Zeta

69

Greek coast. - Bay on the Greek coast.
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Greek coast.

Added 4 weeks ago by Zeta

24

Crab on the beach. - Orange crab on the beach.
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Crab on the beach.

Added 4 weeks ago by Zeta

67

Hammock on the beach. - Hammock on the sunny beach.
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Hammock on the beach.

Added 4 weeks ago by Grażyna

106

Sailboat on the lake. - Sailboat on the lake.
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Sailboat on the lake.

Added 4 weeks ago by Zeta

36

landscape - landscape landscape landscape
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landscape

Added 4 weeks ago by ASK

10

landscape - landscape landscape landscape
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landscape

Added 4 weeks ago by ASK

9

SNIARDWY LAKE - view from the ship to the lake śniardwy
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SNIARDWY LAKE

Added 4 weeks ago by kasia

25

Vietnam. Boat with flowers. - Vietnam. Boat with flowers.
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Vietnam. Boat with flowers.

Added 4 weeks ago by Zeta

91 1