Which one of the following is not an igneous rock?

1.	Which one of the following is not an igneous rock?
Answer» Gabbro Granite Dolomite Basalt Solution :Igneous rocks form from when hot, molten rockcrystallizes and solidifies. The melt originates deep within the Earth near active plate boundaries or hot spots, then rises toward the surface. Igneous rocks are divided into TWO groups, intrusive or extrusive, depending UPON where the molten rock solidifies. EXAMPLES of intrusive igneous rocks are diorite, gabbro granite, pegmatite, and peridotite. Extrusive igneous rocks erupt ONTO the surface, where they cool quickly to form small crystals.

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