6th Grade-Classifying Rocks Review

What are 3 ways that sedimentary rock can give us evidence of life?

• forms created under the ocean floor

• forms being made from mud

• containing organic material

• All of the above

Why are sedimentary rocks often formed in layers?

• because of the cooling of rocks

• because of the heating of rocks

• deposition of sediment

• the rocks are placed that way by people

How do sedimentary rocks change to metamorphic rocks?

• by being carried by water

• by being broken down

• by weathering

• by being exposed to extreme heat

What are 3 processes that lead directly to the formation of sedimentary rock?

• deposition or rocks, freezing of water in cracks of rock, movement of wind

• melting rock, freezing water, movement of wind

• weathering, melting, and erosion

• deposition or rocks, melting of rocks, and erosion

Crystals of igneous rocks that help classify it are the result of:

• melted rock that has formed

• rock layers

• chemical reactions

• erosion of rock

Why are metamorphic rocks different from other rocks?

• they form from existing rocks

• they form from a chemical reaction

• they form from weathering

• they form from freezing water

What are two rock formations that are similar

• sedimentary and igenous rocks

• igneous and metamorphic rocks

• sedimentary and metamorphic rocks

• none of the above

Igneous rocks

• change from physical state to a liquid

• are always in a physical state

• are always in a liquid state

• change from a liquid to a physical state

How can sedimentary rocks change into igneous rocks?

• by melting

• by weathering

• by being compacted

• by breaking

Pressure can change igneous and sedimentary rocks into

• organisms

• bigger rocks

• metamorphic rocks

• glaciers