Igneous Rocks -Multiple Choice Questions Quiz

Question 1: Igneous rocks are formed from:

(a) Compression of sediments
(b) Solidification of magma or lava
(c) High temperature and pressure on existing rocks
(d) Weathering and erosion of rocks

Question 2: Which of the following textures is characterized by large, visible crystals in igneous rocks?

(a) Fine-grained
(b) Glassy
(c) Porphyritic
(d) Coarse-grained

Question 3: Which type of igneous rock is rich in potassium feldspar and quartz and typically light-colored?

(a) Basalt
(b) Granite
(c) Obsidian
(d) Pumice

Question 4: What type of igneous rock is extrusive, fine-grained, and dark-colored?

(a) Basalt
(b) Granite
(c) Obsidian
(d) Pumice

Question 5: Which type of igneous rock has a glassy texture and is formed from the rapid cooling of lava?

(a) Basalt
(b) Granite
(c) Obsidian
(d) Pumice

Question 6: What type of igneous rock is characterized by large crystals surrounded by a fine-grained matrix?

(a) Basalt
(b) Granite
(c) Obsidian
(d) Pumice

Question 7: Which process is responsible for the formation of igneous rocks in the Earth's crust?

(a) Metamorphism
(b) Weathering and erosion
(c) Solidification of magma or lava
(d) Compression and cementation of sediments

Question 8: The texture of an igneous rock is primarily determined by which factor?

(a) The mineral composition of the rock
(b) The cooling rate of the magma or lava
(c) The pressure and temperature during formation
(d) The presence of fossils in the rock

Question 9: What type of igneous rock is formed from volcanic ash and other pyroclastic materials?

(a) Basalt
(b) Granite
(c) Rhyolite
(d) Gabbro

Question 10: What is the term for the process of magma cooling and solidifying beneath the Earth's surface to form igneous rocks?

(a) Weathering
(b) Erosion
(c) Intrusion
(d) Extrusion

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Results:

Total score: /10

Answer key:

Question 1: b

Question 2: d

Question 3: b

Question 4: a

Question 5: c

Question 6: c

Question 7: c

Question 8: b

Question 9: c

Question 10: c