The correct answer is letter C.
Explanation: A simple and inexpensive way to improve soil fertility is by installing green manure or mulching, which adds organic materials and nitrogen to the soil, increases biological activity and recovers leached (washed) nutrients to the deepest layers.
470,693 square miles (1.22 million km
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cause of tension was that the Soviet Union was trying to spread communism. The U.S. was against communism and they took leadership of containment policy. The Containment policy was the U.S. approach to trying to prevent communism spreading.
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In the United States, the 1890s were marked by a severe economic depression sparked by the Panic of 1893, as well as several strikes in the industrial workforce. The decade saw much of the development of the automobile.
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Explanation: the Roman Empire was long-lived for many reasons, some of which being new laws and engineering, military potency, and social legislation to combat political fragmentation along with exceptional leaders.
