Transcript Metamorphic Rocks - Noadswood Science

Metamorphic Rocks
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LO: To know how metamorphic rocks are formed
What does the term “metamorphic”
mean?
Break it down:
What does “morph” mean?
How can we link this to a rock type?
Can you metamorphose
chocolate?!
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 Collect an instruction sheet and a mini mars bar.
 Work your way through the sheet filling out the
different sections as you go.
 Stick the sheet into your book.
So what are metamorphic rocks?
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 Metamorphic rocks are formed from existing sedimentary rocks that are
changed because of heat or pressure
 Earth movements may cause rocks to be deeply buried or squeezed these rocks are heated and put under great pressure but they do not melt
(if they melt they become igneous rocks)
 The minerals they contain are changed chemically, forming metamorphic
rocks
Formation
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 Compare the following metamorphic rocks from the sedimentary
rock they formed from (we know what sedimentary rock they
formed from as they have the same chemical composition)…
Heat &
PRESSURE
Limestone
(with bivalve fossils)
Marble
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Metamorphic Rocks
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 Marble is formed from limestone
 Very high temperatures break down the shells and they form
small crystals (but the rock does not melt)
Limestone
Marble
Metamorphic Rocks
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 Slate is formed from clay
 As the clay gets heated and compressed the tiny plate-like
particles align in the same direction (split into sheets, great for
roofing material)
HEAT &
PRESSURE
Clay
Slate
How are diamonds formed?
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 Read the diamonds are forever
information and answer the
questions.
Metamorphic
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 Complete the metamorphic
rocks worksheet
Metamorphic
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What type of rock am I?
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1. I am formed when lava cools quickly
2. I am formed from compaction of tiny grains of sand
3. I am formed deep within the earths crust from heat
and pressure
4. I am formed from molten rock
5. I sometimes contain fossils
6. I am the hardest substance known to man
7. I am formed when magma cools slowly
8. I am easily eroded by acid rain