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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.
Beach in Bali. - Beautiful beach in Bali ...
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Beach in Bali.

Added yesterday by Grażyna

9

Portland. - USA. Main state. Portland city.
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Portland.

Added 2 days ago by Grażyna

60

Autumn at the seaside. - Our sea is beautiful at any time of the year.
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Autumn at the seaside.

Added 2 days ago by Zeta

80

priscilla - I like jigsaw puzzles with people
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priscilla

Added 3 days ago by pri

16

PLAZA IN GEEK - MIS COULD BE HOT IN GREECE
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PLAZA IN GEEK

Added 4 days ago by Magda

81

A beautiful holiday - Holidays in a nice and warm place
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A beautiful holiday

Added 5 days ago by Hhh

40 2

nature itself - same nature ---- maki, maki
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nature itself

Added 5 days ago by Basiunia

64

Island with blue - Beach with blue water
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Island with blue

Added 6 days ago by Hhh

97

Angry sea. - 10 on the Beaufort scale !!!
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Angry sea.

Added 6 days ago by Grażyna

168

Cliff of Los Gigantes - Los Gigantes coastal town, whose name comes from Acantilados de los Gigantes, huge cliffs that reach
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Cliff of Los Gigantes

Added 9 days ago by Monika

102

Swinoujscie. - Greetings from Świnoujście.
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Swinoujscie.

Added 9 days ago by Grażyna

240

Philippines. - Beach on the island of Boracay.
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Philippines.

Added 10 days ago by Grażyna

60

Bosporus.. - Turkey. Istanbul. Bridge.
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Bosporus..

Added 11 days ago by Grażyna

105 1

Dominican Republic. - Or maybe for an autumn vacation to the Dominican Republic?
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Dominican Republic.

Added 2 weeks ago by Grażyna

157

Caribbean. - Blooming tree on the beach.
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Caribbean.

Added 2 weeks ago by Grażyna

228

Sardinia. - The second largest - after Sicily - island in the Mediterranean. The territory of Italy.
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Sardinia.

Added 2 weeks ago by Zeta

180 1

Island of Ischia. - Italian island of Ischia.
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Island of Ischia.

Added 2 weeks ago by Zeta

221 1

Albania. - Beach with red deck chairs.
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Albania.

Added 2 weeks ago by Grażyna

52

cove - cove - Spanish coast
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cove

Added 2 weeks ago by Elizabeth

202

sunset in Dziwnów - sunset in Dziwnów
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sunset in Dziwnów

Added 2 weeks ago by Druuna

31

beach in Dziwnów - empty beach in Dziwnów
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beach in Dziwnów

Added 2 weeks ago by Druuna

48

Zalew Zegrzyński. - Pilawa port on the Zegrze Reservoir.
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Zalew Zegrzyński.

Added 2 weeks ago by Zeta

56

Europe. Italy. - The city of San Remo in Italy.
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Europe. Italy.

Added 2 weeks ago by Grażyna

41

Beautiful Masuria. - Our beautiful and fairy-tale Masuria.
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Beautiful Masuria.

Added 2 weeks ago by Zeta

60 1

Portofino. - Europe. Italy. Portofino.
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Portofino.

Added 2 weeks ago by Grażyna

74

Torpedownia - Torpedownia in Gdynia view from the beach
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Torpedownia

Added 3 weeks ago by ha ha

37

Monkey Island. - Rożnowskie Lake: Monkey Island.
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Monkey Island.

Added 3 weeks ago by Grażyna

50

wooden bridge - wooden jetty seaside landscape
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wooden bridge

Added 3 weeks ago by sandra

97

beautiful - oj la la la la la la la
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beautiful

Added 3 weeks ago by MAJAMA

202

Walking promenade. - Albania. Walking promenade.
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Walking promenade.

Added 3 weeks ago by Grażyna

217 1

Albania. - Europe. Beach in Albania.
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Albania.

Added 3 weeks ago by Grażyna

112

Australia. - Australia. Charming Sydney.
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Australia.

Added 3 weeks ago by Grażyna

83

Sniardwy lake. - A bridge on the lake Śniardwy.
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Sniardwy lake.

Added 3 weeks ago by Zeta

91

Bora-Bora. - Rajskie Bora-Bora in French Polynesia.
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Bora-Bora.

Added 3 weeks ago by Zeta

75

Polish accent on Zanzibar. - House of Vanilla House Dorota Katende, a Polish traveler.
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Polish accent on Zanzibar.

Added 3 weeks ago by Zeta

155 1

Santorini. - Hotel pool on Santorini.
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Santorini.

Added 3 weeks ago by Zeta

102