1
CO2 emitted by volcanoes into the atmosphere is removed by a series of chemical reactions related to rock weathering.
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2
Sunlight that warms Earth is re-emitted as infrared radiation, which is absorbed by greenhouse gases and causes further warming.
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3
Arctic sea ice melted on an unprecedented scale in 2012, opening up the fabled Northwest and Northeast passages.
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4
Has Earth changed over deep time? How did Earth shape life and life shape Earth? What does Earth's climate in the distant past tell us about the future? Andrew H. Knoll of Harvard University, Naomi Oreskes of the University of California, San Diego, and Daniel P. Schrag of Harvard University guide...
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5
Today, oxygen, or O2, makes up about 21% of Earth's atmosphere, but for most of our planet's long history, O2 levels in the atmosphere and dissolved in the ocean were much less than they are today. In this Click and Learn, you will learn the complex biological and geological factors that have...
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6
These are some of the animal species Charles Darwin would have seen when he visited the Galapagos Islands.
Grade Level   K 1 2 3
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