By the layer of ash that was deposited in the ground.
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15
Which type of igneous rock takes millions of years to cool and has large grains on it?
Plutonic
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15
What are fossils that are only found in one type of rock layer, and that layer will have more than one of that type of fossil, even if the layer contains other types of fossils.?
Index Fossils
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15
What is stratigraphy?
The study of rock layers.
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What are the chemical changes happening in the rock cycle?
Variations of pressure and temperature.
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15
How does igneous rock form?
It forms when magma cools and forms crystals.
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What are the physical changes that happen in the rock cycle?
Melting, Cooling, Eroding, Compacting, or Deforming.
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What are sediments?
Sediments are fragments of rocks and minerals that can vary in size.
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15
How does regional metamorphism work?
Pressure from the movement of plates causes friction, thus creating metamorphic rock.
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thief
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15
Which type of igneous rock takes seconds to months to cool down and has microscopic grains?
Extrusive
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What is magma?
Melted rock.
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What is weathering?
Being worn down by long exposure to the atmosphere.
