Igneous Rocks MCQs
Igneous Rocks MCQs
Try to answer these Igneous Rocks MCQs and check your understanding of the Igneous Rocks subject. Scroll down and let's begin!
1: Granite, diorite, gabbro, and peridotite are ________ rocks.
A. Crust and upper mantle
B. Radioactive decay
C. Magnetosphere
D. Igneous intrusive
2: Compaction would probably be most significant as a lithification process for ________.
A. Shale
B. Sandstone
C. Conglomerate
D. Breccia
3: You find an extrusive igneous rock. it _____.
A. Was formed from lava cooling on earth's surface
B. Was formed by ice on mountains
C. Was formed in deep ocean
D. None of these
4: When sand lithifies, the resulting rock is commonly called ________.
A. Sandstone
B. Shale
C. Conglomerate
D. Breccia
5: organic sedimentary rocks are _____.
A. Made of dissolved minerals
B. Formed from heat and pressure
C. Made from the remains of living organisms
D. Formed when magma or lava cools very quickly
6: What are igneous rocks?
A. Rocks formed from the accumulation of sedimentary layers
B. Rocks formed from the alteration of pre-existing rocks by heat and pressure
C. Rocks formed from the cooling and solidification of molten magma or lava
D. Rocks formed from the compression and cementation of organic materials
7: What is the texture of an igneous rock that cools quickly, with small mineral grains that are not easily visible with the naked eye?
A. Fine-grained
B. Coarse-grained
C. Porous
D. Glassy
8: Which type of igneous rock is rich in iron and magnesium, and typically dark in color?
A. Basalt
B. Granite
C. Rhyolite
D. Andesite
9: What is the term for the intrusive equivalent of basalt, with the same mineral composition but a coarse-grained texture?
A. Andesite
B. Granite
C. Gabbro
D. Diorite
10: How are extrusive igneous rocks formed?
A. By the cooling and solidification of magma below the Earth's surface
B. By the cooling and solidification of lava on the Earth's surface
C. By the compression and cementation of organic materials
D. By the alteration of pre-existing rocks by heat and pressure
11: Which type of igneous rock is light-colored, with a high silica content, and often contains large visible mineral grains?
A. Basalt
B. Andesite
C. Granite
D. Rhyolite
12: What is the term for a fine-grained, extrusive igneous rock that is the most abundant volcanic rock on Earth's surface?
A. Basalt
B. Granite
C. Rhyolite
D. Andesite
13: Which process is responsible for the formation of igneous rocks?
A. Erosion and sedimentation
B. Melting and cooling of magma or lava
C. Pressure and heat
D. Weathering and erosion
14: What is the name of the coarse-grained, intrusive igneous rock that is similar in composition to basalt but forms beneath the Earth's surface?
A. Gabbro
B. Rhyolite
C. Diorite
D. Andesite
15: Which of the following rocks is an example of an extrusive igneous rock?
A. Obsidian
B. Pumice
C. Gabbro
D. Basalt
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Igneous Rocks MCQs
