Rock Cycle Lecture

Rock Cycle Lecture

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Multiple Choice

Metamorphic rocks are created by huge amounts of heat and melting.

• True

• False

Multiple Choice

Sedimentary rocks are created when sediments are laid down in layers.

• True

• False

​A grand, epic tale of rocks turning into rocks because of rocks near it.

It's sedimentary!

​FIRST, they're deposited or laid down in layers (river banks, deltas, coasts, or lakes).

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​THEN, they're cemented together like glue.

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​THEN, they're compacted together. Why? Because of the pressure weighing down on them from layers on top.

​And metamorphic!

​This type of rock is formed deeper in Earth's crust, under miles and miles of pressure!

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​The heat and pressure soften and warp them until they start changing chemically.

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They're stronger/harder, sometimes sparkly or have shiny / smooth surfaces.

​Annnd Igneous!

​Eventually, rocks get "buried" so deep into the lithosphere that they just... melt!

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​This is what makes them magma, but they're not igneous rocks yet! Liquid, molten magma has to cool down back into solid rocks.

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​Depending on how fast they cool, we get different types and looks of igneous rocks.

Multiple Choice

Which of the three rock types we know of suffer the most heat?

• Sedimentary

• Metamorphic

• Igneous

Multiple Choice

Which of the three rock types we know of suffer the most pressure?

• Sedimentary

• Metamorphic

• Igneous

​What processes form different rock types?

Weathering and erosion.

​Compaction.

​Cementation.

​Heat and pressure.

​Melting and cooling.