Chapter 6 Lesson 2 Classifying Rocks

What is melted, or molten, rock below Earth's surface called?

• limestone

• crystals

• sandstone

• magma

What type of rocks form from small bits that are weathered and eroded and then settle on top of one another in layers?

• sedimentary

• igneous with small crystals

• metamorphic with large crystals

• metamorphic

Slate is a metamorphic rock. What does that statement tell you about it?

• It formed from heat and pressure acting on another rock.

• It is not affected by very hot temperatures inside Earth.

• It has large crystals that slowly cooled.

• It is loosely formed from tiny clay bits.

A rock that formed from magma has very large crystals. How did it cool?

• very slowly

• very quickly

• under water

• on land

A rock has layers and is made from small grains. What type of rock is it?

• metamorphic

• igneous

• sedimentary

• volcanic

When coal is exposed to extremely high temperatures, it changes into a hard rock called

anthracite without melting.

Anthracite is most likely ______________

• igneous

• metamorphic

• sedimentary

• mineral

On a trip to the Southwest, Mario went on a nature walk. He found a rock that looked like

it was made of grains of sand. There were layers of different color in the rock in shades of

red and orange.

Mario's rock is most likely a(n) _____________

• metamorphic

• igneous

• sedimentary

• topaz

Greywacke is a rock commonly found in New Zealand. Muddy sand breaks into sediment

that is eroded by rivers. After it is deposited in deep water, that sediment is compressed

and sticks together, forming the gray rock known as Greywacke.

Greywacke is most likely a (n) __________

• sedimentary

• igneous

• metamorphic

• cement

Rhyolite is a rock that can form from magma that cools. The rock can have large and small

crystals. Rhyolite forms more often from continental, or land-based, volcanic eruptions

than from eruptions in the ocean.

Rhyolite is most likely a(n)

• sedimentary

• metamorphic

• igneous

• ruby

Which type of rock was the first to exist on the planet?

• igneous

• planet

• sedimentary

• metamorphic