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Two octopuses sitting underwater highlight the different textures the animals can take on.
Overview

Octopuses and Squids

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Plastic bottles and other marine debris cover a rocky beach in Curacao.
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Marine Plastics

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Seagrasses are flowering plants that can form dense underwater meadows and are an important shallow water habitat.
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Seagrass and Seagrass Beds

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Chrysaora melanaster is a jellyfish found in the Arctic.
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Jellyfish and Comb Jellies

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Two Adélie penguins on Paulet Island, Antarctica
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Penguins

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two mangrove trees in the crashing waves
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Mangroves

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Waves breaking on the shore
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Currents, Waves, and Tides

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An oil drilling platform in oil-free water two years after the Deepwater Horizon oil spill in the Gulf of Mexico.
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Gulf Oil Spill

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On average, Arctic sea ice has decreased by four percent per decade since the late 1970s.
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Sea Level Rise

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a frond of kelp underwater
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Kelp and Kelp Forests

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Hurricane Katrina
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Hurricanes, Typhoons, and Cyclones

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Japanese scientists videotaped this female giant squid, alive, at the water's surface
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Giant Squid

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