Compléter Fill in the Blanks: Intrusive and Extrusive Igneous RocksVersion en ligne Test your knowledge about intrusive and extrusive igneous rocks in this fun Fill in the Blanks game! par Mark Masloski 1 fine rocks molten Intrusive Earth's cools crust granite lava grained history basalt crystals and extrusive igneous are formed from rock material . Intrusive rocks are formed when magma and solidifies beneath the surface , while extrusive rocks are formed when cools and solidifies on the Earth's surface . Intrusive rocks have larger and a coarse - texture , while extrusive rocks have smaller crystals and a - grained texture . Examples of intrusive rocks include and diorite , while examples of extrusive rocks include and obsidian . These rocks play an important role in the formation of the Earth's and can provide valuable information about the geological of an area .
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