How are extrusive rocks formed?


How are extrusive rocks formed?

Toothpaste and Volcanoes:

Have you ever squeezed a new tube of toothpaste and watched the snake like rope come out of the end. The process of squeezing the toothpaste out of the tube can be called extrusion. The toothpaste is coming out of the tube, therefore it is being extruded. When lava is coming out of a volcano it is often extruding out of the mouth of the volcano just like the toothpaste.

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Extrusive rocks are formed when lava from a volcano cools rapidly on the surface. The crystal size of extrusive rock is generally microscopic because...

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Extrusive Rocks: Definition & Examples


Chapter 5 / Lesson 2

In this lesson, learn about extrusive igneous rocks. Discover how extrusive rocks form, extrusive igneous rock characteristics, and see extrusive rock examples.

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