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igneous
Volcanic rock in North America.
Trivia about igneous
Of the 3 main classes of rock, this one is further divided into plutonic & volcanic types
Of sedimentary, metamorphic or igneous, it's the type of rock formed when it cools and solidifies
Formed at the Earth's surface, basalt is the extrusive type of this "Big 3" type of rock
For science, classify rocks according to their 3 main types: metamorphic, sedimentary & this
Pumice is a variety of this type of rock formed when lava cools
Formed by magma, this one of the 3 major types of rock may be plutonic, or formed deep in the Earth
Of the 3 main classes of rock, this one is further divided into plutonic & volcanic types