NATURAL RESOURCES.
The earth's natural resources include water and land, plant and animal life, coal, oil and various minerals. Air, sunshine, and climate are also natural resources. All natural resources are not evenly distributed over the earth, and they vary in quality from place to place. For example, only about a third of the earth's land can be used for farming and raising livestock. Much of the rest is either too dry, too cold, or too mountainous. Deposits of coal and oil, two of the earth's most important energy resources, occur on every continent. But the United States alone has about a third of the world's coal deposits, and more than half the world's oil lies in the Middle East. The earth has more than 2,000 different kinds of minerals. However, only about 100 are common. Graphite, gypsum, salt, and talc are some of the earth's most common minerals. Scarce minerals include diamonds, gold and platinum. Other important minerals include aluminium, copper, iron, lead, magnesium, nickel, silver, tin, uranium and zinc.
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