Question

Write the difference between extrusive and intrusive igneous rock

Answer 1

Answer:

Extrusive rocks are formed on the surface of the Earth from lava, which is magma that has emerged from underground. Intrusive rocks are formed from magma that cools and solidifies within the crust of the planet. ... If lava cools almost instantly, the rocks that form are glassy with no individual crystals, like obsidian.Oct

Answer 2

Extrusive Igneous Rocks-

They are formed by cooling of molten magma on the earth's surface .The magma which is brought to the surface through fissures or volcanic eruptions soldifies to form rocks .

Intrusive Igneous Rocks -

When the magma soldifies within the earth's crust it cools slowly forming hard rocks with large crystals e. g granite