3. Rocks

Which statement about rocks is accurate?

• Rocks consist of a single mineral.

• Coal is not classified as a true rock.

• Most rocks are mixtures of minerals.

Metamorphic rock is formed by:

• Heat and pressure.

• Cooling magma.

• Sediment compaction.

A rock formed from hardened magma beneath the Earth's surface is known as:

• Intrusive igneous rock.

• Extrusive igneous rock.

• Metamorphic rock.

An igneous rock with 25% dark silicate minerals and mostly plagioclase feldspar has a:

• Granitic composition.

• Basaltic composition.

• Andesitic composition.

What is the correct sequence for the formation of sedimentary rocks?

• Weathering, erosion, deposition.

• Compaction, cementation, erosion.

• Erosion, weathering, compaction.

Fossils are typically found in:

• Igneous rocks.

• Sedimentary rocks.

• Metamorphic rocks.

Sedimentary rocks with ripple marks indicate formation:

• Along a beach or river.

• From shell fragments.

• When wet mud dried.

The process where physical forces break rock without altering its chemical composition is called:

• Mechanical weathering.

• Chemical weathering.

• Erosion.

Which weathering process involves water freezing and thawing?

• Frost wedging.

• Exfoliation.

• Unloading.

The fading inscriptions on marble gravestones are due to:

• Mechanical weathering.

• Chemical weathering.

• Frost wedging.