Water power can be replaced naturally in a short period of time, so it is a

• renewable resources
• metamorphic rock
• nonrenewable resource
• mineral

A rock created by heat and pressure is called a

• metamorphic rock
• igneous rock
• mineral
• sedimentary

Most plant roots grow in

• topsoil
• subsoil
• bedrock
• smog

The protection of Natural Resources is called

• Conservation
• rock cycle
• renewable resource
• luster

New objects are made from old objects when you

• recycle
• reduce
• reuse
• conserve

When fossil fuels are burned, the resulting particles can cause

• smog
• smoke
• fog
• rainbows

A solid natural material made from nonliving substances in the ground is a

• mineral
• soil
• gem
• pollution

As lava or magma cools, a(n) _________
is formed.

• igneous rock
• metamorphic rock
• sedimentary rock
• rock cycle

The continuous process in which rocks change from one kind into another is called 

• rock cycle
• sedimentary rock
• metamorphic rock
• circle of life

The way a mineral reflects light is its

• luster
• hardness
• streak
• fracture