Rock Type Features Examples
Igneous • made from cooled magma or lava
• can be very smooth like glass or have tiny holes
• can have small crystals, large crystals, or no crystals black, glasslike obsidian and a rough, hole-filled lava rock
Sedimentary • made of layers of sediment
• can have animal or plant material, or small pieces of rock small rock made of gravel and pebbles and a rock with colorful layers of sediment
Metamorphic • made by heat and pressure
• may have wavy bands or crystals black and white rock with marbled bands and a black and white rock with compressed, mixed crystals
On his camping trip, Alex finds a rock that has a curvy pattern of bands. Later, Alex tries to identify the type of rock that he has found. He discovers that rocks with these kinds of bands were often formed under the Earth's crust under a lot of pressure.
Which type of rock has Alex found?
A.
igneous
B.
volcanic glass
C.
metamorphic
D.
sedimentary
1 answer
Alex has found a rock that has a curvy pattern of bands, which indicates that it was formed by heat and pressure. Based on the information provided in the table, the type of rock that is formed under these conditions is metamorphic rock.
Therefore, the correct answer is: C. metamorphic
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