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What is an extrusive igneous rock?
An extrusive igneous rock is a type of rock formed through very fast cooling of lava, above the Earth‘s surface. (1)
What does an extrusive igneous rock look like?
Extrusive igneous rocks have very small almost microscopic crystals. (1) These are often described as fine-grained rocks. (1) You usually can’t see these with the naked eye. (1)
What are types of extrusive igneous rock?
The most common type of extrusive rock is basalt. (1)
Resources
1. https://www.wikihow.com/Identify-Igneous-Rocks
