Miracle Planet - Snow Ball Earth 4/5

A snowball earth would stay frozen once frozen; so what melted the ice? A manganese dioxide deposit gives some clue. One scientist focused on volcanic eruptions as contributing more oxygen into the air and warming the earth. This second-to-last video in a five-part series brings us to the cusp of humanity.

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6th - 9th
2 more...
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1 more...
Instructional Strategy
Flipped Classroom
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Fine Print: Educational Use