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provides lessons, video clips, and interactive resources for learning about the Antarctic Ice Sheet, research in Antarctica, the carbon cycle, the difference between weather and climate, carbon dioxide and its physical properties, changes in carbon dioxide concentrations, greenhouse gases, the physics of the greenhouse effect, drilling into the Greenland Ice Sheet and examining ice cores, energy consumption, ways to reduce energy consumption at home, and ice and its role in the earth system. (Teachers' Domain, Multiple Agencies)
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The rock record, along with the fossil evidence and sediment it contains, holds many clues about the environmental conditions under which the earliest life forms evolved. For example, we now know that oxygen production began in the oceans at least 2.5 billion years ago and reached present-day levels in the atmosphere just 400 million years ago. |
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El Niño |
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