Upload
sydnee
View
26
Download
0
Tags:
Embed Size (px)
DESCRIPTION
Metamorphic Rocks. Rock Formation. Sedimentary Rocks and Igneous rocks form from: Other Rocks. Metamorphic Rocks form as existing rocks change. Popcorn. How do you make popcorn? Add heat to a kernal . It pops and becomes a fluffy snack. Metamorphism. - PowerPoint PPT Presentation
Citation preview
METAMORPHIC ROCKS
Rock Formation Sedimentary Rocks
and Igneous rocks form from:
Other Rocks
Metamorphic Rocks form as existing rocks change.
Popcorn How do you make
popcorn?
Add heat to a kernal.
It pops and becomes a fluffy snack.
Metamorphism The process
of changing an existing rock by heat or pressure, or both.
Parent Rocks The original
sedimentary or igneous rock is called a parent rock.
Undergoing Change Pressure can cause
a rock’s minerals to flatten out in one direction.
The rock does NOT melt during this process.
If the rock did melt, what kind of rock would we now have?
Recrystallization Crystals form from
minerals. Heat and/or
pressure break the bonds of those atoms.
The bonds then can reform in a new way.
Pg 97 – How rocks change
Changes occur over large and small areas. Changes that occur depend on:
Type of Parent Rock Temperature Pressure
Changes occur over large and small areas.
Large Areas Small Areas
For metamorphic change to occur over large areas there must be:
High Pressure High Temperature
When only one of these is present, changes tend to occur over smaller areas.
Metamorphism Over Large Areas Large blocks of
rocks are pushing together.
Rocks are:BuriedPushed togetherHeatedBent
Deeper the rock, the greater the metamorphism
Metamorphism Over Small Areas Using Heat Magma can push up
through cracks in the rocks.
Lava can cover rocks on the earth’s surface.
Mainly due to high temperature, not pressure.
Metamorphism Over Small Areas Using Pressure Rocks move and
grind past each other during tectonic plate movement.
This creates a great amount of pressure.
Foliation Found in
metamorphic rocks Arrangement of
minerals in flat or wavy parallel bands.
Foliated Rocks Commonly found in
rocks produced by metamorphic change over large areas.
Found in rocks that are composed of more than one mineral
Non-Foliated Rocks Made of mainly one
type of mineral. Different minerals
cannot separate and line up.
Has not been subjected to high pressure.