Ice Ages

infomod.htmlToday, icebergs and sea ice are found in the world's coldest oceans of the Antarctic and Arctic, and glaciers are found at the tops of the highest mountains. But ice on the continents and around the polar seas has grown and retreated many times in the last few million years. Start interactive »

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gauging ocean overturn ratesGoing vertical: Gauging ocean overturn rates
Water in the ocean has different ages at different depths. Scientists can determine these ages, and find out how long water takes to circulate through the entire ocean and then come back to the surface.
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coralDating corals, knowing the ocean
Coral skeletons record the age of the coral, as well as the age of the water in which they grow. Using radioactive decay dating techniques on fossil, scientists can tease this information apart.
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