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coral reef

Coral reefs are diverse underwater ecosystems held together by calcium carbonate structures secreted by corals. Coral reefs are built by colonies of tiny animals found in marine water that contain few nutrients. Most coral reefs are built from stony corals, which in turn consist of polyps that cluster in groups. The polyps belong to a group of animals known as Cnidaria, which also includes sea anemones and jellyfish. Unlike sea anemones, corals secrete hard carbonate exoskeletons which support and protect the coral polyps. Most reefs grow best in warm, shallow, clear, sunny and agitated water. Often called "rainforests of the sea", shallow coral reefs form some of the most diverse ecosystems on Earth. They occupy less than 0.1% of the world's ocean surface, about half the area of France, yet they provide a home for at least 25% of all marine species, including fish, mollusks, worms, crustaceans, echinoderms, sponges, tunicates and other cnidarians. Paradoxically, coral reefs flourish even though they are surrounded by ocean waters that provide few nutrients. They are most commonly found at shallow depths in tropical waters, but deep water and cold water corals also exist on smaller scales in other areas.
Great Barrier Reef. - Great Barrier Reef in Australia.
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Great Barrier Reef.

Added 5 days ago by Zeta

111 1

Oceanic world. - Oceanic underwater world.
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Oceanic world.

Added 6 days ago by Grażyna

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Caribbean. - Underwater life in the Caribbean.
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Caribbean.

Added 3 weeks ago by Grażyna

223 1

Coral reef. - Life on a coral reef.
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Coral reef.

Added 3 weeks ago by Grażyna

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Underwater world. - Australia. Underwater world.
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Underwater world.

Added 4 weeks ago by Grażyna

198

Dolphins in the shoal - Dolphins enjoying dinner
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Dolphins in the shoal

Added 2 months ago by Makronos

14

Underwater world. - Coral reef. The underwater world.
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Underwater world.

Added 3 months ago by Grażyna

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Underwater world. - Mysterious underwater landscape.
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Underwater world.

Added 3 months ago by Grażyna

145

Islands on the ocean. - Small islets on the ocean.
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Islands on the ocean.

Added 3 months ago by Grażyna

87

Underwater world. - Mysterious underwater world.
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Underwater world.

Added 3 months ago by Grażyna

92 2

Aquarium - colorful jigsaw puzzle
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Aquarium

Added 4 months ago by andi

25

Aquarium - colorful jigsaw puzzle.  The best puzzle zone wit animals.  The best puzzle zone wit animals.
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Aquarium

Added 4 months ago by andi

96 1

Underwater world. - Mysterious underwater world.
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Underwater world.

Added 4 months ago by Grażyna

71

Landscape - colorful jigsaw puzzle
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Landscape

Added year ago by andi

137

CORAL REEF - coral reef, sea anemone
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CORAL REEF

Added year ago by sandra

125

CORAL REEF - ocean, coral reef, marine fauna
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CORAL REEF

Added year ago by sandra

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CORAL REEF - coral reef, underwater life, colorful fish
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CORAL REEF

Added year ago by sandra

258

CORAL REEF - coral reef, ocean, underwater world
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CORAL REEF

Added year ago by sandra

335

BAJKOWY VIEW - Vacation, rest, sightseeing
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BAJKOWY VIEW

Added year ago by Ada

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BAJKOWY VIEW - Vacation, rest, sightseeing
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BAJKOWY VIEW

Added year ago by Ada

58

CORAL REEF - coral reef, marine fauna, ocean,
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CORAL REEF

Added year ago by sandra

138

Colorful fish - colorful fish puzzle
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Colorful fish

Added year ago by andi

94

Colorful fish - colorful aquarium puzzle
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Colorful fish

Added year ago by andi

38

View from space - colorful jigsaw puzzle
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View from space

Added year ago by andi

68

Life of the ocean - colorful jigsaw puzzle
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Life of the ocean

Added year ago by andi

36

yards in the depths - depths
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yards in the depths

Added year ago by olka

31

Where is Nemo - Lorem ipsum dolor sit amet
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Where is Nemo

Added year ago by Ayla

53

Fluorescent anemone - Fluorescent anemone
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Fluorescent anemone

Added year ago by Ilona

79 1

Underwater world - colorful puzzle with fishes
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Underwater world

Added year ago by andi

308

Underwater world - colorful puzzle jigsaw
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Underwater world

Added year ago by andi

36

Light illumination - colorful puzzle of trees
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Light illumination

Added year ago by andi

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