What is a fossil?
the preserved remains or traces of an organism
How do most fossils form?
Living things die and their remains are buried by sediments.
A fossil formed when minerals replace all or part of an organism is called a
The process by which all the different kinds of living things have changed over long periods of time is called
A type of organism that no longer exists on Earth is said to be
The law of superposition states that, in horizontal layers of sedimentary rock, each layer is
older than the layer above it.
The geologic time scale is a record of
the life forms and geologic events in Earth's history.
The three major fossil fuels are coal, oil, and
Fossil fuels are energy-rich because they contain
Fossil fuels are considered nonrenewable resources because they
take hundreds of millions of years to form.
What is the result of using fossil fuels more rapidly than they are formed?
They will be used up.
Which of the following is an advantage of solar energy?
It will not run out for billions of years.
What is the most widely used source of renewable energy in the world today?
Coal is a solid fossil fuel formed from
the remains of swamp plants
The most plentiful fossil fuel in the United States is
Which fossil fuel produces the lowest levels of most air pollutants?
Factories where crude oil is separated into fuels and other products are called
is an example of a biomass fuel.
The intense heat from Earth's interior that warms the magma beneath Earth's surface is called
Wind energy is actually an indirect form of
energy from the sun
In a nuclear power plant, what is used to change water into steam?
heat released from nuclear fission reactions
Energy conservation means
reducing energy use.
Name some examples of conserving energy.
Recycling, carpooling, turning lights off when not in use