1
CO2 emitted by volcanoes into the atmosphere is removed by a series of chemical reactions related to rock weathering.
Grade Level   K 1 2 3 4 5 6 7 8 9 10 11 12
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2
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...
Grade Level   K 1 2 3 4 5 6 7 8 9 10 11 12
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3
Current consumption of fossil fuel releases more than 25 billion tons of CO2 into the atmosphere every year. If current trends continue, there will be a tripling of atmospheric CO2 by the end of the century—levels not seen for more than 40 million years. By measuring our carbon footprint, we can...
Grade Level   4 5 6 7 8 9 10 11 12
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4
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...
Grade Level   K 1 2 3 4 5 6 7 8 9 10 11 12
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5
"This hands-on activity requires students to """"visit"""" different K-T boundary sites, evaluate the evidence at each site, find these sites on a map, and predict where the crater is located. It tests a diverse set of skills, including mapping, mathematical scaling, and interpretation of mixed...
Grade Level   6 7 8 9 10 11 12
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