Chapter 9

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conservation

Making a resource last longer.

combustion

The process of burning a fuel to release energy

nuclear fission

The splitting of an atom's nucleus into two smaller nuclei

cast

A fossil that is a copy or an organism's shape formed when minerals seep into a mold

insulation

A layer of material that blocks the transfer of heat between the air inside and the air outside

renewable

Resources that are either always available or are naturally replaced in a short period of time.

nonrenewable

Resources that can be used up or take millions of years to replace.

nuclear fusion

The combining of two nuclei to make one nucleus

They are portable. They are developed and cost less. Big companies make a lot of money.

What are at least two reasons the world continues to depend on fossil fuels?

They are nonrenewable and they pollute.

What are the two major disadvantages of using fossil fuels?

control rods

What controls fission reactions in a nuclear reactor?

hydroelectric power

What do we call electricity produced by flowing water?

Precambrian

What do we call most of the time for Earth's history?

fuel rod

What do you call the nuclear material used to make the energy?

energy conservation

What do you call walking to the library or riding your bike instead of taking a car?

Cenozoic

What is the era people live in?

mold

What kind of fossil is a hollow area is sediment in the shape of an organism or part of an organism?

12.5%

What percentage of a radioactive element will be left after three half-lives?

25 %

What percentage of a radioactive element will be left after two half-lives?

Mesozoic

What was the era dinosaurs lived in?

hydrogen

Which of the following is not a biomass fuel: methane, gasohol, hydrogen or sugar cane waste?

wood

Which of the following is not a fossil fuel: coal, wood, oil, or natural gas

The forest trees can be grown back in a life time.

Why is a paper bag considered renewable?

It comes from oil.

Why is a plastic bag considered nonrenewable?

solar energy

Wind and water are both indirect forms of


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