Guided Notes about Guided Notes about Natural ResourcesNatural Resources

Chapter 25, Section 1Chapter 25, Section 1

1.1. All living things must have All living things must have certain resources to certain resources to grow, grow, develop, maintain life develop, maintain life processes, and reproduceprocesses, and reproduce. In . In addition to food and water, addition to food and water, most animals also need most animals also need sheltershelter..

2. 2. Natural resources include Natural resources include Earth’s air, water, and land; Earth’s air, water, and land; all living things and all living things and nutrients, rocks and nutrients, rocks and mineralsminerals..

3. Renewable resources are 3. Renewable resources are natural natural resources that it is possible to use resources that it is possible to use indefinitely without causing a indefinitely without causing a reduction in the supplyreduction in the supply. They . They include fresh air, surface water, include fresh air, surface water, groundwater, fertile soil, elements groundwater, fertile soil, elements that cycle through Earth’s systems, that cycle through Earth’s systems, and living things.and living things.

4. 4. Resources that exist in an Resources that exist in an inexhaustible supply,inexhaustible supply, such such as solar energyas solar energy, also are , also are renewable resources.renewable resources.

5. 5. Renewable resources are Renewable resources are replaced through replaced through natural natural processes at a rate that is equal processes at a rate that is equal to, or greater than, the rate at to, or greater than, the rate at which they are being usedwhich they are being used..

6. 6. Sustainable yield is Sustainable yield is the the replacement of renewable replacement of renewable resources at the same rate resources at the same rate at which they are consumedat which they are consumed..

7. 7. Sunlight Sunlight is considered to be is considered to be a renewable resource a renewable resource because it will be available because it will be available for the next 5 billion years.for the next 5 billion years.

8. Nonrenewable resources are 8. Nonrenewable resources are resources resources that exist in a fixed amount in Earth’s that exist in a fixed amount in Earth’s crust and can only be replaced by crust and can only be replaced by processes that take hundreds of millions processes that take hundreds of millions of yearsof years. Fossil fuels, gemstones, and . Fossil fuels, gemstones, and metallic elements are nonrenewable. metallic elements are nonrenewable. They are exhaustible because they are They are exhaustible because they are being used at a much higher rate than being used at a much higher rate than they rate at which they rate at which they were formedthey were formed..

9. 9. Natural resources are not Natural resources are not distributed distributed evenly on Earthevenly on Earth. . The wealth of a country is The wealth of a country is determined by determined by the the availability of natural availability of natural resourcesresources..

1. 1. Land provides places for Land provides places for organisms to organisms to livelive and and interactinteract. . It also provides spaces for It also provides spaces for the the growth of crops, forests, growth of crops, forests, grasslands, and for wilderness grasslands, and for wilderness areasareas..

2. 2. 42 percent of the land in the 42 percent of the land in the United States is United States is public landpublic land and and are federally administered to are federally administered to protect protect timber, grazing areas, timber, grazing areas, minerals, and energy resourcesminerals, and energy resources..

3. 3. National wildlife refuges provide National wildlife refuges provide protection of protection of habitats habitats andand breeding areasbreeding areas for wildlife, for wildlife, including endangered species.including endangered species.

4. It can take 4. It can take 10001000 years to form a years to form a few centimeters of few centimeters of soilsoil, yet it can , yet it can be lost in minutes as a result of be lost in minutes as a result of erosionerosion by wind or water. by wind or water. Plowing Plowing and leaving bare ground without and leaving bare ground without plant coverplant cover can increase topsoil can increase topsoil loss.loss.

5. The loss of topsoil can lead to 5. The loss of topsoil can lead to desertification, which is desertification, which is the process the process by which productive land becomes by which productive land becomes desertdesert. This can be prevented by . This can be prevented by reducing reducing overgrazing and by overgrazing and by planting planting trees and shrubs to anchor trees and shrubs to anchor soils and retain watersoils and retain water..

6. 6. Aggregate is Aggregate is a mixture of a mixture of gravel, sand, and crushed stone gravel, sand, and crushed stone that naturally accumulates on that naturally accumulates on the Earth’s surfacethe Earth’s surface. Aggregates . Aggregates are found in floodplains or are found in floodplains or alluvial fans, or are deposited by alluvial fans, or are deposited by glacial activity. glacial activity.

77. An ore is a . An ore is a natural resource natural resource that can be mined at a that can be mined at a profitprofit. The value of an ore on . The value of an ore on the market is greater than the market is greater than the the cost of its extractioncost of its extraction..

8. The most important sources of 8. The most important sources of metallic ore deposits are metallic ore deposits are hydrothermal fluidshydrothermal fluids. Hydrothermal . Hydrothermal veins commonly form along veins commonly form along faultsfaults and and jointsjoints..

Which minerals are often found in Which minerals are often found in placer deposits?placer deposits?

Gold, diamonds, platinum, and gemstones