2. Rocks and Minerals

Multiple Choice

Which of the following properties of minerals is not reliable due to impurities?

• Streak

• Color

• Diaphaneity

• Hardness

Multiple Choice

A geologist rubbed a mineral on a porcelain plate to see its color in powdered form. What property was observed by the geologist?

• Color

• Streak

• Tenacity

• Fracture

Multiple Choice

What mineral property explains why quartz, a mineral, breaks into conchoidal (curved) and uneven surface?

• Tenacity

• Hardness

• Cleavage

• Fracture

Multiple Choice

Which of the following is TRUE about silicate minerals?

• These are rock-forming minerals that contain silicon and oxygen.

• These are the leas abundant minerals on the Earth's crust.

• These are the main components of sedimentary rocks.

• They do not have economical value.

Multiple Choice

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

• Through the accumulation of plant and animal remains

• By the compression of sediments over time

• From the cooling and solidification of magma or lava

• Through changes caused by heat and pressure on existing rocks

Multiple Choice

How are sedimentary rocks formed?

• From the cooling and solidification of magma

• By the compaction and cementation of sediments

• Through the melting of rocks deep underground

• From the crystallization of minerals in water

Multiple Choice

How are metamorphic rocks formed?

• By cooling and solidification of magma

• Through compaction and cementation of sediments

• By exposure of existing rocks to heat and pressure

• Through the accumulation of volcanic ash