15 Questions
What process forms igneous rocks?
Crystallization of magma
What is the meaning of the word 'igneous'?
Fire
In which part of Earth's crust do intrusive igneous rocks form?
Deep below ground
Which type of igneous rock is formed when magma cools slowly inside Earth's surface?
Plutonic rock
What determines the type of crystals formed in igneous rocks?
Composition of the magma
What type of texture does obsidian, an extrusive igneous rock, have?
Glassy
At what stage of the rock cycle are igneous rocks formed?
Crystallization
What is the state of magma when it forms igneous rocks?
Liquid
Which mineral is usually the most abundant oxide in igneous rocks?
Silicon dioxide
What is the characteristic color of felsic rocks?
Light
How do extrusive igneous rocks form?
By crystallization above ground
Which type of igneous rock has a porphyritic texture?
Both intrusive and extrusive rocks
What is the characteristic cooling process for aphanitic igneous rocks?
Fast cooling
Which type of igneous rock is classified as mafic?
Gabbro
What causes the bubbly texture in rocks like pumice?
Discharge of water and gasses from a volcano
Learn about igneous rocks and their formation through the rock cycle. Understand how extreme heat and pressure contribute to the formation of different types of rocks in Earth's crust.
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