Formation of Extrusive and Intrusive Rocks:

Extrusive Rocks:
– Formation: Result from rapid cooling of lava on the Earth’s surface during volcanic eruptions.
– Cooling Rate: Quick cooling leads to fine-grained or glassy textures.
– Examples: Basalt and obsidian are common extrusive rocks.

Intrusive Rocks:
– Formation: Formed from slow cooling of magma beneath the Earth’s surface.
– Cooling Rate: Slow cooling results in coarse-grained textures.
– Examples: Granite and diorite are typical intrusive rocks.

Distinct cooling rates influence textures, creating differences between extrusive and intrusive rock types.