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Igneous rocks are volcanic rocks. They are formed when lava/magma dries. Examples of igneous rocks are pumice, obsidian, and granite.

Sedimentary rocks are rocks formed when layers of sediment are compacted under immense pressure to form a rock. An example is sandstone.

Metamorphic rocks are any rock (igneous, sedimentary, or even metamorphic), is subjected to immense heat and pressure. This causes the rock itself to change to a new rock. Examples are marble and shale.

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Q: How is each of three classes of rocks formed?
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the three type of rocks forces of AIR.


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A school has 18 classes with 35 students in each class. In order to reduce class size to 30, how many new classes must be formed?


What happenes during each method to form intrusive igneous rocks?

Igneous rocks are formed under high heat conditions. Intrusive igneous rocks are formed by the crystallization of magma in the Earth's crust.


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