Question

Difference between extrusive and intrusive landforms of volcanoes

Answer 1

Extrusive or Volcanic Rocks- These rocks are formed when magma breaks through the crust and reaches the surface of earth (where it is known as lava) . It cools rapidly and solidifies to form rocks. The common rocks formed in this manner are basalt and obsidian.
Intrusive or Plutonic Rocks-These rocks are formed when magma fails to break through the crust and cools slowly under the crust forming the rocks. Because of slow cooling it solidifies into rocks with large grain of crystals. The common example of rocks formed in this manner are granite and dolerite.

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: