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A shell placed in seawater with increased acidity slowly dissolves over 45 days.
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Shell Dissolves in Seawater

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Globotruncana falsostuarti -- a foram that lived about 75 million years ago, during the Cretaceous Period.
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Globotruncana falsostuarti

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Two nurse sharks hover over a baited cage
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Corrosion to Corals

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Polar bears are threatened by a lack of sea ice.
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Climate Change at the Poles

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An algal bloom, also known as a red tide, has converted the ocean's surf to a red color
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Scientists Work to Predict and Prevent Algae Blooms

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A walrus sits on top of ice.
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The Cultural Icescapes of the Arctic

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A narwhal breaches the surface, its tusk pointed to the sky
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Why a Tusk? The real-life unicorns of the sea and the tusks that make them famous

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Two nurse sharks hover over a baited cage
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Trophic relationships in Arctic marine ecosystems

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data of sea ice coverage in the Arctic
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Arctic Sea Ice: A New Low?

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In 2011, storms and lack of ice-cover due to a warmer winter climate resulted in hundreds of seal pups being washed up on the shore of Prince Edward Island. Like many, this young seal faced an uncertain future. See more Nature's Best Photos.
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Ice-Loving Seals and the Loss of Sea Ice

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The Greenland glacier Jakobshavn Isbrae is massive, at around 40 miles long and more than a mile thick.
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Up Close and Personal With the Fastest Glacier in the World

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An underwater blizzard of oil, marine microbes, "sea snot", and algae.
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Five Questions with Uta Passow, How An Oil Spill Affects the Movement of Carbon In the Ocean

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