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FINAL Homework 1- Multiple choice questions (1 point each) Please answer all the following questions. Which one of the follow
The ozone layer is Essential for life on earth Caused by the use of fossil fuels Located in the troposphere Natural filter fo
is-Which of the following bodies of water can cleanse itself from a moderate level of water pollutants? Lakes Streams Groundw
b. False 21- Where in the atmosphere do we normally find greenhouse gases? a. Troposphere b. Stratosphere c. Mesosphere d. Th
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Answer #1

1. A natural source is a source which is not man made. It is made by the nature only. The sun, wind and the water is natural while the battery is man made or artificial. So batter is not a natural source.

The answer is C.

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