Igneous Rocks

Where is magma found?

• above the ground

• underground

• in the stratosphere

• in the thermosphere

Describe the texture of the following igneous rock.

• glassy

• rough

• vesicular

• coarse

Describe the texture of the following igneous rock (grain size 1-10 mm).

• vesicular

• glassy

• fine

• coarse

Describe the texture of the following igneous rock (grain size < 1mm).

• glassy

• fine

• coarse

• vesicular

Intrusive igneous rocks are formed ___________.

• fine-grained rocks

• when a molten mass of rocks cools rapidly

• on the Earth's surface

• coarse-grained rocks

Igneous rocks that cool slowly beneath the Earth's crust are ______.

• extrusive

• intrusive

• sedimentary

• always magnetic

Extrusive rocks, which cool more quickly than intrusive rocks, are generally more _______.

• coarse-grained

• fine-grained

• radioactive

• magnetic

A rock with small crystals and light color is classified as

• Plutonic, mafic

• Plutonic, felsic

• Volcanic, mafic

• Volcanic, felsic

Igneous rocks are formed by the process of

• weathering and erosion

• heat and pressure

• melting and cooling

• sediments and compaction

3) What do we call an ordered arrangement of atoms or molecules?

• lava

• magma

• intrusive

• crystals