What is a natural resource that can be replaced by nature as quickly as it is used, such as fresh air, fresh surface water in lakes, rivers, and streams, groundwater, fertile soil, solar energy, and all living things and elements that cycle through Earth's systems?

What is a resource that exists in a fixed amount in Earth's crust and can be replaced only by geological, physical, and chemical processes that take millions of years, such as fossil fuels, diamonds and gemstones, and elements (i.e. gold, silver, and copper)?

What is the replacement of renewable resources at the same rate at which they are consumed?

What is the process where productive land becomes desert because of the loss of topsoil?

What are bacteria that live in water or soil, or grow on the roots of some plants, and can capture nitrogen gas?

What is the process of removing salt from seawater to provide freshwater?

What is a substance that enters Earth's geochemical cycles and can harm the well-being of living things or affect their activities?

What is a mixture of sand, gravel, and crushed stone that accumulates naturally and is found in floodplains, alluvial fans, or glacial deposits?

What is unweathered, solid rock that can consist of limestone, marble, granite, or other quarried rock?

What is a natural resource that can be mined for a profit?

What is the material left after the ore is extracted by grinding the parent rock to separate the ore?

What is material that is consumed to produce energy?

What are fuels derived from living things?

What are energy sources that formed over geologic time as a result of the compression and incomplete decomposition of plants and other organic matter?

What is the light, spongy biomass fuel made up of dead and decaying plant matter that has been compressed called?

What are molecules with only carbon and hydrogen bonds and are easily burned?

What is the power generated by converting the energy of free-falling water to electricity?

What is the energy produced by Earth's naturally occurring heat, steam, and hot water?

What is the process in which an element's nucleus divides to form smaller nuclei and one or two neutrons. In the process, it releases a large amount of energy?

What is the thin, transparent wafer that converts sunlight into electrical energy?

What is the amount of work produced compared to the amount of energy used?

What is the simultaneous production of two usable forms of energy?

What is the global management of Earth's natural resources to ensure that current and future energy needs will be met without harming the environment?

What is an increase in the size of a population over time?

What is the number of organisms that any given environment can support?

What is the process of restoring the land to its original contours and replanting vegetation?

What is the removal of trees from a forested area without adequate replanting?

What is the use of organisms to clean up or break down toxic wastes?

What are environmental factors that do not depend on population size?

What are environmental factors that increasingly affect a population as the population's size increases?

What are chemicals applied to farm fields to control weeds, insects, and fungi?

What is the air pollution that appears as a yellow-brown haze when formed from car exhaust and sunlight called?

What is the extremely thin layer in the ozone over Earth's polar regions called?

What is any precipitation with an acidic pH (less than 5.0) called?

What is the source that generates water-pollution from a single point of origin?

What is the source that generates water-pollution from widely spread areas?

Pollution from an industrial site is an example of a _____.

Pollution from runoff from roads is an example of a _____.

Disease, predators, and competition for food are all examples of _____.

Storms, floods, and fires are all examples of _____.

Concrete and mortar used in construction are made using _____.

What is an example of natural air pollution?

Aggregates, bedrock, and metallic minerals are all _____.

Where does most energy on Earth come from?

Many different types of fossil fuels exist, but they are all originated from _____.

Which is an example of an alternative source of energy?

Which force is most directly responsible for the creation of fossil fuels?

_____ and _____ can reduce the environmental impact of deforestation.

What activity or segement of the population puts the greatest demand on water supplies in the United States?

What is global warming?

As any population increases, its demand for natural resources _____.

Which greenhouse gas has increased as a direct result of burning fossil fuels and deforestation?

Check all that apply : Which of the following are renewable resources?

Check all that apply : Which of the following are nonrenewable resources?

Which method of water control affects the most freshwater resources?

Check all that apply : Which of the following are biomass fuels?

Check all that apply : Which of the following are fossil fuels?

Check all that apply : What resources are necessary to meet the basic needs of an organism?

What modern instrument converts wind to mechanical energy?