Which of the following human and environmental interactions iscaused by gasses being released into the air and affecting the environment at an unnatural rate?
  1. Deforestation
  2. The greenhouse effect
  3. Migration
  4. Diffusion
Explanation
Answer: B - The greenhouse effect is caused by gasses being released into the air and affecting the environment at an unnatural rate. Although gasses are released into the air by natural processes, humans are contributing to this process by manufacturing and the consumption of natural resources. An effect is an increased temperature in the lower atmosphere.
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