Question

keywords
1 core.---- the innermost part of the earth is know as core.
2 ExtrusiveLgneous rock -- if it cools over the earth,s surface ,it form Extrusive lgneous rock

Answer 1

Answer:

What do u want to know about it

Core. --the tough central part of various fruits, containing the seeds, the part of something that is central to its existence or ...

Explanation:

Extrusive rock refers to the mode of igneous volcanic rock formation in which hot magma from inside the Earth flows out onto the surface as lava or explodes violently into the atmosphere to fall back as pyroclastics or tuff.This is as opposed to intrusive rock formation, in which magma does not reach the surface.

Answer 2

Answer:

Extrusive or volcanic rocks:

These rocks are formed when magma breaks through the crust and reaches the surface of the earth (where it is called lava). It cools rapidly and solidifies to form rocks. The common rocks formed in this manner are basalt and obsidian.

Instrusive or plutonic rocks:

These rocks are formed when magma fails to break through the crust and cools slowly under the crust  forming rocks. Because of slow cooling it solidifies into rocks with large grains of crystals. The common eg of rocks formed in this manner are granite and dolerite.

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Explanation: