Answer:Agriculture requires control of stocks of water stored in soil, and of the flow of water across landscapes. In the river basin, extensive constructed systems provide rapid drainage of precipitation from watersheds, so that soils can warm and dry rapidly in the spring, allowing summer crops to grow.
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When Earth was still molten, gravity pulled dense elements down to Earth's center.
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Answer: True
Explanation: mass dependence which is a type of mass u got this
Welp they both had two great oceans between them, a land invasion is near Impossible, and a sea attack would not be smart for the Central Powers/Axis
An Air attack needs refueling and no enemy had a close airbase plus we had anti air any attack on North America or any of the Americas is useless.