Difference between revisions 1900980 and 1900981 on enwikiversity

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Astronomy/Craters
[[Image:Chain of impact craters on Ganymede.jpg|thumb|right|250px|The image shows a chain of craters on Ganymede. Credit: Galileo Project, Brown University, JPL, NASA.]]
A '''crater''' may be any large, roughly circular, depression or hole in or beneath the rocky surface of a rocky object.

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"The last time we saw a permafrost melting was 130,000 years ago. It's a natural phenomenon because of changes in the earth's orbit."<ref name=Henderson>{{ cite book
|author=Gideon Henderson
|title=Mysterious craters blowing out of Russia could mean trouble for the whole planet
|publisher=Yahoo News
|location=
|
monthdate=30 July⏎
|year=  2017
|url=https://www.yahoo.com/news/m/da88ff71-92f7-3f97-a8c7-705d13f80680/mysterious-craters-blowing.html?.tsrc=daily_mail&uh_test=2_04
|accessdate=2017-07-31 }}</ref>

"But what is definitely unprecedented is the rate of warming. The warming that happened 130,000 years ago happened over thousands of years … What we see happening now is warming over decades or a century."<ref name=Henderson/>

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[[Category:Earth sciences/Lectures]]
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[[Category:Planetary sciences/Lectures]]
[[Category:Resources last modified in July 2018]]
[[Category:Technology/Lectures]]