Metamorphic Rocks Lesson

Metamorphic and Igneous Rocks

Open Ended

How are these two rock different?

Poll

Which rock has been subjected to heat and pressure?

• the rock on the left

• the rock on the right

This rock...

has been subjected to heat and pressure. It has been metamorphosed.

Multiple Choice

You've done the reading. So, what does metamorphosed mean?

• made from fire

• made from pieces of other rock

• changed

• What reading?!!

This rock has been changed by heat and pressure.

It is a metamorphic rock.

Heat and Pressure

Heat and pressure turn exiting rock into a new type of rock: a METAMORPHIC rock.

Poll

What do we call the original rock that was metamorphosed?

• Mom rock

• Dad rock

• Dwayne "The Rock" Johnson

• Parent rock

Parent Rock

Every metamorphic rock has a PARENT rock.

Poll

There are two types of metamorphism. Which one do you think involves exisiting rock touching magma?

• Contact Metamorphism

• Regional Metamorphism

• Meta Metamorphism

• Mighty Metamorphism

Contact Metamorphism

occurs when existing rock comes in contact with magma. The heat changes the original minerals.

Regional Metamorphism

This happens due to tectonic activity squeezing existing rock.

Poll

How do you like learning about metamorphic rocks with quizizz?

• It's great!

• It's pretty good.

• I like Peardeck better.

• Wait, we're not in Peardeck?!!

Poll

Hey, before you forget...What are the two types of SEDIMENTARY ROCKS?

• Organic

• Clastic

• Detrital

• Chemical

• Non-clastic

Open Ended

What's different about these two rocks?

Open Ended

Based on the illustration, FOLIATED must mean...

Foliated Metamorphic Rock

Foliated rocks have a banded appearance. The minerals in the rocks have been squeezed or pulled into the bands.

Poll

This rock doesn't have bands. It must be...

• foliated

• non-foliated

• sedimentary

• shy

Now for IGENOUS Rocks!

​

Poll

Do you know this key term?

The process in which crystals grow together from liquid rock is...

• sedimentation

• compaction

• crystallization

• cementation

Poll

Think about this...

Which would cool more quickly?

• a hot lunch kept in an insulated bag

• a hot lunch left on the table

• Stop talking about lunch. I'm hungry

These Facts Rock!

Igneous rocks that form underground cool more slowly than rocks that cool above ground.

Cooling slowly allows more time for crystals to grow in the rocks.

Poll

Which rock do you think cooled underground?

This rock is diorite. It forms from melted rock underground.

• Note the obvious crystals in the rock. The crystals had time to grow as the rock cooled slowly underground.

Poll

By the way, what’s the term for melted rock underground?

• Lava

• Magma

INTRUSIVE Igneous Rocks

• INTRUSIVE igneous rocks form from MAGMA beneath the ground. Most have obvious crystal growth.

Poll

Think about this...

If intrusive rocks form under the ground, then EXTRUSIVE igneous rocks must form...

• on the surface

• also beneath the ground

• from the dust under my bed.

Poll

Extrusive Igneous Rocks

Extrusive igneous rocks form from LAVA that has EXITED the volcano. “Extrusive” sounds like “exit.” Get it?

• Yeah, I get it

• Can you run that by me again?

• Yeah, I know, sedimentary rocks from from heat and pressure...blah blah blah

Poll

True or False

Extrusive igneous rocks cool quickly on the surface and have much smaller crystals.

• True

• False

Sometimes igneous rocks are classified by their GRAIN SIZE.

• ●A rock with a COARSE grain has large crystals.

  ●A rock with a FINE grain has small crystals.

Poll

Which rock is COARSE grained?

Poll

Think about this...

Which rock type would most likely contain FOSSILS?

• sedimentary

• igneous

• metamorphic

Open Ended

Almost all fossils are found in sedimentary rock.

Why?

Review Questions

for points!

Multiple Choice

True / False: Metamorphic rocks can be metamorphosed more than once.

• True

• False

Multiple Choice

How do metamorphic rocks form? 

• Heat and Pressure
• Compaction & Cementation
• Cooling of Magma
• Sediments & Glue

Multiple Choice

__________ metamorphism occurs when magma heats the surrounding rock and changes it.

• Regional

• Forced

• Igneotrophic

• Contact

Multiple Choice

The original rock before metamorphism is called a -

• original

• parent rock

• kid rock

• starter rock

Multiple Choice

Metamorphic Rocks are classified by

• Mineral Composition

• Texture (foliated / non foliated)

• Grain Sizes

• How they formed.

Multiple Choice

__________ metamorphic rocks have mineral grains that are not arranged in distinct bands.

• Conglomerate

• Non-foliated

• Foliated

• Permeated

Multiple Choice

How do Intrusive Igneous rocks cool?

• quickly
• slowly
• really fast

Multiple Choice

Intrusive Igneous rocks will be

• coarse grain

• fine grain