Question

Give an example of extrusive rock that does not contain any crystal. Also list its use.

Answer 1

Answer:

If the magma contains abundant volatile components which are released as free gas, then it may cool with large or small vesicles (bubble-shaped cavities) such as in pumice, scoria, or vesicular basalt. Other examples of extrusive rocks are rhyolite and andesite.

Explanation:

Explanation: Extrusive igneous rocks form when magma hardens above the earth's surface. Examples of these include pumice and basalt. Pumice is used in toothpaste and cosmetic products, while basalt is used in the construction of statues and buildings.

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