Types of Rocks Quiz

What process at the surface of the Earth is part of the formation of sedimentary rocks?

• Rain falling into the ocean

• Water depositing sediment in layers

• The cycle of day and night

• Magma rising from the Earth's mantle

Answer explanation

Water depositing sediment in layers is a key process in the formation of sedimentary rocks. Over time, layers of sediment accumulate and compact, eventually forming solid rock.

_______ form when one kind of rock changes into another due to changing temperature and pressure.

• Metamorphic rocks

• Igneous rocks

• Sedimentary rocks

• Volcanic rocks

Answer explanation

Metamorphic rocks form when existing rocks undergo changes due to increased temperature and pressure, altering their mineral composition and structure. This process distinguishes them from igneous, sedimentary, and volcanic rocks.

Because of the way they form, fossils are usually only found in _______ rocks.

• metamorphic

• mineral

• sedimentary

• igneous

Answer explanation

Fossils are typically found in sedimentary rocks because these rocks form from the accumulation of sediments, which can include the remains of organisms. Metamorphic and igneous rocks do not preserve fossils due to their formation processes.

Which of the following correctly describes how igneous rocks are formed?

• water breaks off pieces of rocks and moves them to new locations

• another kind of rock is exposed to a lot of pressure and heat

• layers of sediment are pressed down on top of each other

• melted rock cools, either above ground or underground

Answer explanation

Igneous rocks are formed when melted rock, known as magma or lava, cools and solidifies. This process can occur either beneath the Earth's surface (intrusive) or on the surface (extrusive), making the correct choice the cooling of melted rock.

_______ start out as one kind of rock, but large amounts of pressure and heat change them into a different kind.

• Metamorphic rocks

• Fossils

• Igneous rocks

• Sedimentary rocks

• Limestone

Answer explanation

Metamorphic rocks start as one type of rock and undergo changes due to high pressure and heat, transforming into a different type. This process distinguishes them from igneous, sedimentary rocks, and fossils.

What type of rock forms from layers of sediment that are buried?

• Igneous rock

• Metamorphic rock

• Sedimentary rock

• Volcanic rock

Answer explanation

Sedimentary rock forms from the accumulation and compaction of layers of sediment over time. This process distinguishes it from igneous and metamorphic rocks, which form through different geological processes.

What is the material called that forms when mud and tiny pieces of rock settle out of moving water?

• Lava

• Sediment

• Magma

• Fossil

Answer explanation

The material that forms when mud and tiny pieces of rock settle out of moving water is called sediment. It accumulates in layers and can eventually become sedimentary rock.

What causes minerals to line up in a parallel pattern in metamorphic rocks?

• Cooling

• Erosion

• Heat and pressure

• Freezing

Answer explanation

Heat and pressure cause minerals in metamorphic rocks to realign and form a parallel pattern. This process, known as foliation, occurs when existing rocks are subjected to intense conditions, altering their structure.

Which of the following is an example of an igneous rock?

• Limestone

• Sandstone

• Granite

• Shale

Answer explanation

Granite is an igneous rock formed from the cooling and solidification of magma. In contrast, limestone, sandstone, and shale are sedimentary rocks, which are formed from the accumulation of sediments.

What are metamorphic rocks formed from?

• New rocks

• Preexisting rocks

• Liquid magma

• Sand and gravel

Answer explanation

Metamorphic rocks are formed from preexisting rocks that undergo changes due to heat, pressure, or chemically active fluids. This process alters their mineral composition and structure, distinguishing them from new rocks or other materials.