1、Prentice Hall EARTH SCIENCE Tarbuck Lutgens Chapter 4 Earths ResourcesRenewable and Nonrenewable Resources4.1 Energy and Mineral Resources Renewable resources can be replenished over fairly short spans of time, such as months, years, or decades. Nonrenewable resources take millions of years to form
2、and accumulate. Fossil Fuels4.1 Energy and Mineral Resources Fossil fuels are hydrocarbons that may be used as fuel, including coal, oil, and natural gas. Anticlines Are Common Oil TrapsTar Sands and Oil Shale4.1 Energy and Mineral Resources Fuels derived from tar sand and oils shales could become g
3、ood substitutes for dwindling petroleum supplies.Formation of Mineral Deposits4.1 Energy and Mineral Resources Some of the most important mineral deposits form through igneous processes and from hydrothermal solutions. Ore is a useful metallic mineral that can be mined at a profit. Mineral-Rich Hot Water Seeps into Rock FracturesNonmetallic Mineral Resources4.1 Energy and Mineral Resources Nonmetallic mineral resources are extracted and processed either for the nonmetallic elements they contain or for their physical and chemical properties. Uses of Nonmetallic Minerals
