Density (a) is the correct answer
<span>Scientists believe that differences in density cause hot, plastic-like rock in the asthenosphere to rise toward earth's surface. </span>
<span>The solving or tilting of rocks, followed by renewed deposition.
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It begins at the Baikal Mountains in Russia and ends at the Lena Delta into the Arctic ocean, also found in Russia.
The Second War brought complete destruction to that region. Entire cities were leveled by the germans and russians.<span>. If you go to Poland today, for example, what you see in Warsaw and Gdansk are copies. The "medieval" buildings are all or mostly reconstructions, from the rubble left behind by German and Soviet bombs and artillery. After that, the communists imposed central planning on top of a destroyed economic base. It's very hard to regenerate money from nothing, and most of what is produced in eastern Europe went into Warsaw Pact defenses and salaries and privileges for the communist party elite, to keep the system of authority in place. After the fall of communism, the post-Cold War governments inherited another kind of economic decay. They instituted "reform" plams to shock the economies into the free market, leaving in their wake massive unemployment and property.</span>
Answer:
It is important because:
Explanation:
It is one of the largest reserves of natural gas found in the country, and adds considerably to the natural gas supply. The reason the formation is so important lies in its economic significance. Shale gas is much cheaper than oil, and the Marcellus Shale significantly enhances our reserves.
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