Question

which of the following is not a class of sedimentary rock? volcanic chemical organic clastic rock that forms when existing rock is altered by extreme heat and pressure sedimentary rock metamorphic rock igneous rock rock that forms when magma or molten rock cools and hardens sedimentary rock metamorphic rock igneous rock

Explanation:

• Sedimentary rocks have three main classes: clastic (formed from fragments of other rocks), chemical (formed from precipitation of minerals from water), and organic (formed from the remains of plants and animals). Volcanic rocks are a type of igneous rock (formed from the cooling of magma or lava).
• Metamorphic rocks form when existing rocks are altered by extreme heat and pressure.
• Igneous rocks form when magma or molten rock cools and hardens.

Answer:

1. volcanic
2. metamorphic rock
3. igneous rock