Chapter 9
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
