1. The two types of igneous rock are extrusive and intrusive. .Extrusive igneous rocks form when lava hardens above Earth's surface and intrusive forms when magma hardens below Earth's surface .An example of intrusive is gabbro and extrusive is basalt.
2. The two types of metamorphic rock are foliated and non-foliated. Foliated rocks, such as gneiss have a layered or banded appearance which is produced by heat and direct pressure. Non-foliated rocks, such as marble, do not have a layered appearance.
3. The two type of sedimentary rock are clastic and chemical. Clastic sedimentary rocks, such as breccia, form from mechanical weathering. Chemical sedimentary rocks, such as rock salt, form when dissolved materials precipitate from solution.
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