Which is a common characteristic of extrusive igneous rock? a. cools slowly b. forms crystals c. contains small grains d. contains large grains

The answer is; C

Extrusive rock is one that forms when magma finds its way to the surface of the earth. The lava cools quite fast compared to intrusive rock that cools before it reaches the earth's surface. Lava that cools fast forms small crystals. Examples of extrusive rocks include; basalt, obsidian, and rhyolite.   Intrusive rocks cool slowly and form large crystals.

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organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.