Question

extrusive igneous rockscharcaterisitcs any 2?

Answer 1

Answer :-

Characteristics of extrusive igneous rocks:

• THEY ARE NON-POROUS AND NON- PERMEABLE.  
• THEY ARE NOT FOSSILIFEROUS , THEY ARE HARD AND PRIMARY ROCKS.
• THEY ARE OF GREAT ECONOMIC IMPORTANCE.

Answer 2

Answer:

Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals. Some cool so quickly that they form an amorphous glass. These rocks include: andesite, basalt, dacite, obsidian, pumice, rhyolite, scoria, and tuff.

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