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Question
What does ozone protect the earth from?
Options:
A
.
 Sound waves
B
.
 Harmful UV radiation
C
.
 Visible radiation
D
.
 Greenhouse effect
Answer: Option B
Answer:
(b).
Harmful UV radiation
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A new renewable energy system is designed to harvest energy from wind. The total energy required to build the system is ....energy provided by the system over its lifetime is _____
Question 9.
Which of the following is not a type of primary resource?....
Question 10.
The ratio of energy received from a raw energy source to energy spent to obtain the raw energy source is called as _____....to obtain the raw energy source is called as _____
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