18 Questions
What type of rock forms when basaltic magma mixes with granitic magmas?
Diorite
Which rock is considered an intrusive basalt equivalent?
Gabbro
What type of rock has a medium or coarse-grained texture and rarely contains quartz?
Gabbro
What type of rock is formed by the end stage of magma's crystallization and contains exceptionally large crystals?
Pegmatite
Which rock is formed when the liquid rock cools very slowly over a long period of time underground?
Gabbro
Where are most Pegmatites found in relation to other types of rocks?
Near large masses of igneous rocks called batholiths
What is the most common intrusive rock in Earth's continental crust?
Granite
Which intrusive igneous rock is characterized by the presence of a feldspathoid mineral like nepheline or leucite?
Syenite
Which type of igneous rocks are formed inside the Earth?
Intrusive rocks
What type of igneous rock is basalt?
Extrusive
What is the main difference between intrusive and extrusive igneous rocks?
Texture
What color is diorite typically found in?
Grey
Which of the following is an example of an extrusive igneous rock?
Basalt
What causes partial melting of the oceanic plate to produce a basaltic magma?
Plate Tectonics
What causes the vesicular texture in some extrusive igneous rocks?
Gases trapped during cooling
Which type of rock can be observed with naked eyes due to the presence of visible minerals?
Plutonic Rock
What type of texture do intrusive igneous rocks like granite and diorite have?
Coarse texture with large mineral grains
Why does obsidian have a smooth texture with no visible grains?
It cools quickly into volcanic glass with no time for crystal growth
Learn about the formation of igneous rocks inside and outside the Earth's crust. Discover the difference between intrusive and extrusive igneous rocks and common examples like granite and diorite.
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