OA

Rocks are broken up into three major groups:

• A: magma, metamorphic, and minerals
• B: igneous, metamorphic, and sedimentary
• C: sedimentary, sand, and igneous
• D: sand, mud, and silt

Rocks that come out of volcanoes form the greater part of the Earth's crust. These rocks are:

• A: igneous rocks
• B: basalt
• C: metamorphic rocks
• D: granite

Chalk and limestone are made up of the remains of animals. They are:

• A: both very hard
• B: pebbles
• C: sedimentary rocks
• D: conglomerates

From deep within the earth molten magma bubbles up, heating rocks that surround it. This process turns igneous and sedimentary rocks:

• A: gneiss
• B: slate
• C: marble
• D: metamorphic rocks

This is the name of the solid rock beneath the soil:

• A: extrusive rock
• B: limestone
• C: bedrock
• D: granite

Coal is a sedimentary rock made up of organic matter that has become solid. Unlike limestone, coal is made up of:

• A: plant fossils
• B: shells
• C: insects
• D: dinosaurs

Mud, silt, and sand are all:

• A: glassy
• B: sediments
• C: fossil fuels
• D: in clouds that come out of volcanoes

You can group igneous rocks by the sizes of grains in them. Coarse grained rocks are ____ and fine grained rocks are ____.

• A: intrusive; extrusive
• B: crystals; minerals
• C: volcanic; metamorphic
• D: intrusive; only made of silica

Diamonds, like many rocks that come from natural resources, are made of compressed:

• A: quartz
• B: aluminum
• C: carbon
• D: kimberlite