Types of Rocks

Erosion, wind, and weathering form this type of rock.

• sedimentary

• igneous

• metamorphic

Tags

NGSS.MS-ESS2-2

As rock gets buried through tectonic movement, the pressure and heat causes these types of rocks to form.

• sedimentary

• igneous

• metamorphic

Igneous rock is formed when

• magma cools

• erosion layers rock

• Rock composition changes do to plate burial

Which of the following processes is one of the first steps in the formation of some sedimentary rock?

• Rock is broken down into pieces.

• Liquid magma cools and hardens.

• Rock melts deep underground.

• Minerals change due to pressure.

Answer explanation

Clastic sedimentary rocks are made up of pieces (clasts) of pre-existing rocks.

Tags

NGSS.MS-ESS2-2

In order to be classified as metamorphic, a rock must–

• have been completely melted.

• change with heat and pressure.

• be made of small bits of larger rock.

• have formed very quickly.

Answer explanation

Metamorphic rocks form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination of these factors.

What is one of the most common processes that turns sediments into sedimentary rocks

• Organisms in the soil breaking down organic matter into useful chemicals

• Minerals within rock layers growing into large crystals over time

• Layers made of bits of broken rock pressing down on other layers

• Magma cooling under the surface of Earth, crystallizing to form rock

Each rock type can follow only one pathway of the rock cycle.

• True

• False

Tags

NGSS.MS-ESS2-1

True or False: Molten rock inside of a volcano is called lava

• True

• False

Answer explanation

Scientists use the term magma for molten rock that is underground and lava for molten rock that breaks through the Earth's surface.

Which of the following is NOT one of the three types of rock?

• Metamorphic

• Magma

• Sedimentary

• Igneous

Answer explanation

The types of rock: igneous, metamorphic and sedimentary

This rock was formed by smaller pieces of rock that settled at the bottom of a lake millions of years ago. What type of rock is this?

• Sedimentary
• Igneous
• Metamorphic