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Resources from the Earth’s Crust

Resources from the Earth’s Crust. Chapter 24.2. Land Resources Public Land - more than 828 million acres of public land in the U.S. - include national parks, preserves, and wildlife refuges. Top Soil - it can take up to 500 years to form 1 centimeter of topsoil.

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Resources from the Earth’s Crust

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  1. Resources from the Earth’s Crust Chapter 24.2

  2. Land Resources Public Land - more than 828 million acres of public land in the U.S. - include national parks, preserves, and wildlife refuges. Top Soil - it can take up to 500 years to form 1 centimeter of topsoil. - without plant roots to hold it in place, wind or water can remove it. - loss of topsoil can lead to desertification. - especially a problem in arid regions such as Africa, Western U.S., Australia, & Middle East.

  3. Aggregates - sand, gravel, & crushed stone - used in construction (mixed with cement to make concrete) Bedrock - layers of rock that can be quarried and used in homes & buildings (flooring, counter tops, block walls) Ores - ‘mineral-containing’ rock that can be mined for profit.

  4. Effects of Mining Surface mining - removal of overlying material to expose ore. - alters landscape - exposes surface to toxic substances. Underground mining - digging of tunnels to area of ore to be removed. - especially dangerous to miners - surface may be vulnerable to sink holes Tailings - material left behind after ore is extracted from rock. - may contain harmful substances that contaminate soil or groundwater. Video – McCaw School of Mines

  5. Limestone quarry at 291 Hwy & Kentucky Rd.

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