Diamonds are minerals-pieces of rocky earth materials. Why are they so expensive? Explain using the concept of supply and demand.

loess contribute to the flooding of rivers by providing the silt that is washed into rivers and constantly raises the bed of the rivers. this elevation above the surrounding flood plains and dams allow the river to overwhelm the dams and flood thousand of square miles of neighboring flood plains.

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answer; existed; limited;

answer; night terrors;