Why igneous stocks crystalline? Explain
the difference between extrusive &
intrusiverocks ?
Answers
Answer:
They are formed by the cooling of molten magma on the earth's surface. The magma, which is brought to the surface through fissures or volcanic eruptions, solidifies at a faster rate. Hence such rocks are smooth, crystalline and fine-grained.
The difference between intrusive and extrusive igneous is that, intrusive rock is one that forms when magma cools within Earth. Extrusive igneous rock is one that, forms when lava cools on Earths surface. ... Because formations of intrusive igneous rock can be harder and more lasting than other types of rocks.
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Answer:
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Explanation:
Rocks form when mineral compounds react with heat, water or pressure. Intense heat that liquefies inside the Earth makes hot molten material called magma. Lava is magma that pushes up through the Earth's crust to the surface. When magma and lava cool and harden, they create igneous rocks. These rocks may be extrusive or intrusive, depending on where the magma or lava crystallizes. Basalt is the most common extrusive rock while granite is a very common intrusive rock.