Answer:
1.) How do solar thermal generators work?
D.) They use solar cells to covert sunlight directly into electricity
2.) Fossil fuel dependence has an impact on which of the following?
A.) the environment
3.) How much money does the United States lose each year due to the non-local resource trade deficit?
D.) 300 billion
Explanation:
In solar thermal generators. they depends solely on sun's energy for its energy generation and distribution. <em>The energy generation made use of solar cells which are cells joined together in series which helps in trapping the sun's energy and converting them into electric charges for its onward transmission to the circuit and battery leading to electricity. </em>
On the other-hand, over dependence on fossil fuel causes environmental issues like global warming due to gas flaring etc.
Answer:
Explanation:
Between about 800 and 1200 AD, partly in response to the new currents of trade, Africans in the southern sahel developed a set of trading states with an elaborate organization.Well before 1500 AD, a number of states had come into existence, that had no connection at all with the trade across the Sahara.
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Definitely cell phone reception! However books could be argued for since they also are a good more than a necessity. However the last 2 i believe would be classified more as necessities than goods.
~Hope this helps!~
