Any material made naturally that is used by humans or living things.
A natural resource that can be used and replaced over a relatively short time.
A natural resource that cannot be replaced or that can be replaced only over thousands or millions of years.
Energy as solar, wind, or nuclear energy that can replace traditional fossil fuel sources, such as coal, oil, and natural gas.
Renewable energy derived from burning organic materials such as wood and alcohol.
Conservation method in which old materials are processed to make new ones.
Nonrenewable energy resource, such as oil and coal, formed over millions of years from the remains of dead plants and other organisms.
Inexhaustible energy resource that used hot magma or hot, dry rocks from below Earth's surface to generate electricity.
Electricity produced by water-power using large dams in a river.
Alternative energy source that is based on atomic fission.
Energy from the Sun that is clean, inexhaustible, and can be transformed into electricity by solar cells.
Careful use of resources to reduce damage to the environment though such methods as composting and recycling materials.
A resource that remains in constant supply and will not run out.
Fossil fuel formed from marine organisms that is often found in tilted or folded rock layers and is used for cooking and heating.
able to be reused or recycled
the number of births per 1,000 women
able to be maintained or continued
something being released, especially pollution
a natural fuel such as coal or fas, formed from the remains of living things
the impact of human activities on the environment
the number of people or organisms that can be supported
the using up of a resource
governmental decisions concerning issues within a country
the level of wealth and comforts in which someone is living
governmental decisions concerning issues with other countries
more than enough; extra
a lack of something
materials or substances such as minerals, forests, water, and fertile land that occur in nature and can be used for economic gain
parts of the world that are less technologically and economically advanced
The air that surrounds us (10)
a community together with its environment (9)
carelessly discharged paper (6)
of or pertaining to the sun (5)
the exhaust produced by cars (9)
a mixture of decaying materials used as fertilizer (7)
the circumstances or conditions that surround us (11)
to make unfit for or harmful to living things (7)
to keep in existence: maintain (11)
a method of solid waste disposal (8)
to protect from loss or depletion (8)
no longer living (7)
to keep or maintain (8)
to make new or restore (9)
grown or raised without chemicals (7)
the science of organisms and their environment (7)
the area or environment in which we live (7)
to use again as for another purpose (7)