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atmosphere

An atmosphere (from Greek ἀτμός (atmos), meaning 'vapour', and σφαῖρα (sphaira), meaning 'sphere') is a layer or a set of layers of gases surrounding a planet or other material body, that is held in place by the gravity of that body. An atmosphere is more likely to be retained if the gravity it is subject to is high and the temperature of the atmosphere is low. The atmosphere of Earth is composed of nitrogen (about 78%), oxygen (about 21%), argon (about 0.9%) with carbon dioxide and other gases in trace amounts. Oxygen is used by most organisms for respiration; nitrogen is fixed by bacteria and lightning to produce ammonia used in the construction of nucleotides and amino acids; and carbon dioxide is used by plants, algae and cyanobacteria for photosynthesis. The atmosphere helps to protect living organisms from genetic damage by solar ultraviolet radiation, solar wind and cosmic rays. The current composition of the Earth's atmosphere is the product of billions of years of biochemical modification of the paleoatmosphere by living organisms. The term stellar atmosphere describes the outer region of a star and typically includes the portion above the opaque photosphere. Stars with sufficiently low temperatures may have outer atmospheres with compound molecules.
Blue sky. - Blue sky. Flower meadow.
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Blue sky.

Added today by Grażyna

10

Rays of the sun. - Rays of the setting sun.
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Rays of the sun.

Added 2 days ago by Zeta

89 1

Golden Gate Bridge. - Golden Gate bridge in the fog.
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Golden Gate Bridge.

Added week ago by Zeta

125

Morning in the forest. - Morning in a forest clearing.
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Morning in the forest.

Added week ago by Zeta

102 5

Cloudy sky. - Cloudy sky over the field.
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Cloudy sky.

Added 8 days ago by Zeta

146

SURPRISE 2 - THE LUMINOUS FUND OF AN AMBULANT
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SURPRISE 2

Added 10 days ago by MIAN

7

Aurora borealis - oj la la la la la la la
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Aurora borealis

Added 2 weeks ago by MAJAMA

71

Stormy evening. - Stormy evening on the fields.
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Stormy evening.

Added 2 weeks ago by Zeta

58

cute ghosts - beautiful, peaceful, miles of spirits
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cute ghosts

Added 3 weeks ago by MAJAMA

3

Milky Way - heaven unknown but liked
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Milky Way

Added 3 weeks ago by Makronos

61

West is approaching - a beautiful sunset is approaching
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West is approaching

Added 3 weeks ago by Mila

21

Cherry blossoms - Blossoming cherry at the edge of a waterfall
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Cherry blossoms

Added 4 weeks ago by Ann

104

Manarola Italy - oj la la la la la la la
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Manarola Italy

Added 4 weeks ago by MAJAMA

97

Sunset. - Sunset in Masuria.
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Sunset.

Added month ago by Zeta

116

Egyptian pyramids - The Egyptian pyramids are ancient pyramid-shaped masonry structures located in Egypt. As of November
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Egyptian pyramids

Added month ago by Jeżyna

135

California Coast. - California. Anacapa Islands.
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California Coast.

Added month ago by Zeta

33

Balloons .. - A lovely landscape with balloons in the background.
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Balloons ..

Added month ago by Grażyna

106

Football - colorful jigsaw puzzle
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Football

Added month ago by andi

8

winter morning - la ma i have baja
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winter morning

Added month ago by MAJAMA

129

Landscape - colorful jigsaw puzzle
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Landscape

Added month ago by andi

150 1

Landscape - colorful jigsaw puzzle
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Landscape

Added month ago by andi

69

Galaxy wow - galaxy on litters
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Galaxy wow

Added month ago by MAJAMA

27

Landscape - colorful jigsaw puzzle
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Landscape

Added month ago by andi

110

BAJKOWY VIEW - Vacation, holidays, rest.
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BAJKOWY VIEW

Added 2 months ago by ada

45

Switzerland. - View of the lake Thunersee.
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Switzerland.

Added 2 months ago by Grażyna

64

Les 7 règles de la vie - A décalogue simple en français
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Les 7 règles de la vie

Added 2 months ago by Davide

32

Sunset over the Po Delta. - Sunset over the Po Delta.
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Sunset over the Po Delta.

Added 2 months ago by Zeta

117

Storm over the lake. - Storm over Starnberger See.
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Storm over the lake.

Added 2 months ago by Zeta

34

With a dog in the mountains. - Rest in the mountains.
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With a dog in the mountains.

Added 2 months ago by Zeta

24 1

tree and meadow - tree and meadow with wide sky
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tree and meadow

Added 2 months ago by internet

49 3

Landscape - colorful jigsaw puzzle
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Landscape

Added 2 months ago by andi

239 1

OLa dogs - this game is very nice
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OLa dogs

Added 2 months ago by ania

1

green hills - green hills, river, reflection of the sun
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green hills

Added 3 months ago by sandra

154

Mountain landscape - Arrange the puzzles that will present the mountain landscape
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Mountain landscape

Added 3 months ago by XYZ

92