CE 211 - Igneous Rocks and Rock Cycle Quiz

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18 Questions

What is the term used to describe very fine-grained igneous rocks?

Aphanitic

Which type of igneous rock texture is characterized by the presence of both coarse and fine-grained minerals?

Porphyritic

Which type of igneous rock texture is formed when magma or lava cools very quickly, resulting in a glassy appearance?

Glassy

What is the term used to describe the ejection of fragmented rock material from a volcanic eruption?

Pyroclastic Materials

Which type of igneous rock texture is characterized by very large, coarse-grained minerals?

Pegmatitic

What is the name given to the rough, jagged surface of an aa lava flow?

Aa Lava

What type of igneous rock has a glassy texture?

Obsidian

Which type of igneous material is formed by explosive volcanic eruptions?

Pyroclastic materials

What type of igneous rock has a coarse-grained, pegmatitic texture?

Pegmatite

Which type of lava flow has a rough, clinkery surface?

Aa lava

Which of the following is an extrusive igneous rock?

Basalt

What is the main difference between intrusive and extrusive igneous rocks?

Intrusive rocks cool more slowly than extrusive rocks.

What category of igneous rocks contains more light-colored feldspars and silica than dark-colored minerals?

Granitic rocks

Which type of igneous rock is known for containing mostly darker silicate minerals and calcium-rich plagioclase feldspar, with little quartz?

Basaltic rocks

What is the primary mineral in granitic rocks that makes up about 70% of the Earth's crust?

Feldspar

Which type of igneous rock tends to be more dense than granitic rocks?

Basaltic rocks

What category of igneous rocks has a composition between granites and basalts, with approximately 25% dark silicate minerals?

Andesitic rocks

What is the term used for basaltic lava that has a rough, jagged surface texture?

Aa lava

Test your knowledge on the origin of magma in relation to plate tectonics, Bowen’s Reaction Series, mineral crystallization, melting temperatures, rock compositions, textures, and classification of igneous rocks.

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