Which of the following is not a process that forms metallic ore?

placer deposits
fossil compaction
hydrothermal solutions
igneous processes

5. Which of the following nonmetallic mineral resources is used both as a building material and as an industrial mineral?

sulfur
limestone
graphite
corundum

6. What is one of the drawbacks to the extensive use of solar energy?

It is nonrenewable.
Necessary equipment and installation are expensive.
It is available only at night.
Its use produces pollution.

7. How does nuclear fission produce energy?
Moving water turns turbines to produce electricity.
A controlled nuclear chain reaction produces heat, driving steam turbines to produce energy.
An uncontrolled nuclear reaction produces heat, driving steam turbines to produce energy.
Carbon atoms are bombarded by neutrons.

8. Hydroelectric power is produced by ____.
falling water that turns a turbine
tides that pour through a dam barrier
hot water that comes from deep underground
electric current that flows across a dam