Answers by Dan Gifford
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Answers by Dan Gifford

Answers by Dan Gifford
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(1) Scientists generally agree that Earth is getting warmer due to what's called the greenhouse effect. (2) A greenhouse stays warm because sunlight and heat coming through the glass roof are mostly trapped.
answered Mar 26, 2017
4 votes
193k views
Which part of Europe has advanced communications and transportation systems?
answered Apr 22, 2016
2 votes
141k views
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