a. Differentiate between intrusive and extrusive rocks. (4 marks) Intrusive rocks Extrusive rocks 5 ii.
Answers
Answer:
Intrusive rock, also called plutonic rock, igneous rock formed from magma forced into older rocks at depths within the Earth’s crust, which then slowly solidifies below the Earth’s surface, though it may later be exposed by erosion. Igneous intrusions form a variety of rock types.
Extrusive rock, any rock derived from magma (molten silicate material) that was poured out or ejected at Earth’s surface. By contrast, intrusive rocks are formed from magma that was forced into older rocks at depth within Earth’s crust; the molten material then slowly solidifies below Earth’s surface, where it may later be exposed through erosion. Extrusive rocks are usually distinguished from intrusive rocks on the basis of their texture and mineral composition.
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Answer:
Intrusive Rocks :
1) Intrusive rocks are formed when the magma cools and solidify below the surface of the earth.
2) These rocks cools down slowly.
3) They have caurse texture with large crystals.
extrusive rocks :
1) these rocks are Formed when cooling molten magma on the surface of the earth.
2) these rocks are solidify as a faster peace
3) they are smooth,crystaline and fine grained