8)Warming of the sphere that occurs when certain gases absorb part of the solar radiation reflect by the Earth is called ...
A) acid rain B) greenhouse effect
9) ...rain occurs when pollution in the air is absorbed by water droplets in clouds. A) Dirty B) Acid
10) Global warming is seen by many as a ....to humanity
A) threat B) treat
11) Forests, farmland, and oceans are known as “natural...”
A) research B) resources
12) One way to reduce the amount of garbage is by ...This way,a plastic bottle can be melted to create other plastic bottles, a glass bottle can be used to make other glass bottles,etc.
A)resizing B)recicling
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