Like oil and gas, coal is a fossil fuel because it stores solar energy that reached Earth long time ago.
a. true
b. false
Ans: a. true
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____________________ are materials and energy in nature that are essential or useful to humans
Fill in the blanks with correct word
The widest continental shelf on Earth is located in the ____________ Sea. Fill in the blank(s) with the appropriate word(s)
Deep lakes with steep banks that have a small amount of plant nutrients are ____.
A. oligotrophic lakes B. eutrophic lakes C. culturally eutrophic lakes D. hypereutrophic lakes E. mesotrophic lakes
The Kyoto Protocol uses the 1990 emission levels of each nation as a baseline target for greenhouse gas reductions. Which of the following countries showed the greatest increase in greenhouse gas emissions from 1990 to 2012?
A) Japan B) Australia C) United States D) Russia E) Canada