D. Hydrogen
Two elements make up the overwhelming majority of the sun's matter, by mass: hydrogen (about 70 percent) and helium (about 28 percent).
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The answer is c. on the earth’s surface directly above the initial release of seismic energy.
The definition of an epicentre: the point on the earth's surface directly above the origin of an earthquake (Cambridge Dictionary)
In Geology, we said that it is directly above the focus, which is the initial release of seismic energy mentioned in the above sentence.
As the other options do not have the correct location (e.g. within the Earth's surface, beneath the focus).
Therefore, the answer is c. on the earth’s surface directly above the initial release of seismic energy.
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Desalination could be a viable water source for small cities located near oceans. ocean desalination, which transforms salt water into fresh, clean water, has an intuitive appeal.
The best or even one of the best choices to address water shortages may not be ocean desalination, according to recent data, even in coastal towns. Saline water—typically sea water—is artificially transformed into fresh water through a process called desalination. Reverse osmosis and distillation are the two most used desalination techniques. There are numerous approaches. Even with the most advanced membrane desalination technology, extracting the salts still uses a lot of electricity. Desalination plants on a large scale cost a lot of money to build. Such water is nevertheless fairly expensive for domestic use and typically prohibitively expensive for agricultural usage because of all the power required. Millions of people worldwide depend on desalination to get fresh water. However, it often isn't sustainable, it consumes a lot of energy, and it can hurt marine wildlife.
Learn more about desalination here:
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Answer: b
Explanation: the coil cant be too short or too long