2
________ is organic matter
that can be a source of energy. (85)
5
_______ happens when an atom splits into two or more
lighter atoms. (81)
8
The fission products created in nuclear power plants are
_________. (82)
10
_________ is a mixture of hydrocarbons that are in
the form of liquids. (77)
11
______ precipitation is rain, sleet, or snow that contains
a lot of acids, often because of air pollutants. (79)
12
Newspaper, aluminum cans, some _______ containers,
and many types of paper can be recycled. (73)
18
__________ means using things
that have been thrown away to make new objects. (73)
19
People use some natural resources, such as
coal and wind, for _______. (71)
20
_______ energy is the energy that is released when atoms
come together or break apart. (81)
21
A ____________
resource is a resource that is used much faster than it
can be replaced. (72)
22
______ is a brownish
haze that forms when sunlight reacts with pollution in the
air. (77)
23
A _______ ________ is any material from Earth that is
used by people. (71)
26
________ cells, or solar cells, can change sunlight into
electrical energy. (84)
28
______ happens when two or more atoms join to form
a heavier atom. (82)
29
Petroleum can be harmful to animals and their _________.
31
_____ is air that is moving. (83)
33
A part or function; purpose (76)
34
Remember that
people remove coal from the Earth by _______ it. (79)
36
You can conserve
energy by being _______ to use it only when you need to. (73)
37
________ energy sources are sources of energy
that are not fossil fuels. (81)
38
______ plants use the energy to produce electricity. (75)
39
A ______ ____ is an energy resource made from the remains of
plants and tiny animals that lived long ago. (75)