I think it is Earthquakes
Yepp that's truth. Mesopotamia will be live but America will be under water.
Perseve what? You have no explanation or anything.
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.