¿El espacio geográfico es fundamental para los seres humanos?
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What is the result of the greenhouse effect? a. heat is deflected from the atmosphere. b. heat is released from the atmosphere. c. heat is kept in the atmosphere. d. plants are able to grow in the tropics where the air is the heaviest.

Which of the following terms describes the layers of air surrounding the earth ?

How does sea floor spreading relate to supercontinents?