Rocks

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Rocks
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What is a rocks favorite cereal?
Coco pebbles!
Whats a rocks favorite golf course?
Pebble Beach!
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Types of Rocks
Metamorphic Rocks
Squeezed heated together
Melted cooled together
Cemented together
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Sedimentary RocksHow are they made?

• Wind and water break down the earth
• Bits of earth settle in lakes and rivers
• Layers are formed and build up
• Pressure and time turn the layers to rock

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Classification of Sedimentary Rocks
Sedimentary Rock
clastic
non-clastic
broken pieces of rock
chemical (created when water evaporates)
organic (created from remains of plants animals)
eg. limestone
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Sedimentary Rocks
Where do you think sedimentary rocks would be
formed/found near?
streams beaches rivers deserts oceans glaciers
coral reefs
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Types of Sedimentary Rocks
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Metamorphic RocksHow are they made?

• Meta means change so these are rocks that have
  changed.
• They were once igneous, sedimentary, or other
  metamorphic rocks.
• Pressure and heat cause the change.

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Classification
Metamorphic Rock
foliated
nonfoliated
leafy flattened layered minerals
no banding
slate
quartzite
These rocks are physically deformed and
chemically changed due to temperature and
pressure changes but the rock does not melt!
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Where are metamorphic rocks likely formed/found
near?

• In fault zones
• Mountain belts
• Mid-ocean ridges

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Types of Metamorphic Rocks
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Igneous RocksWhat are They?

• Ignis is Latin for fire-igneous rocks are fire
  rocks
• Formed underground by trapped, cooled magma
• Formed above ground when volcanoes erupt and
  magma cools

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light colored eg. quartz
dark colored eg. Iron magnesium containing
mafic
felsic
Igneous Rock
intrusive (plutonic)
extrusive (volcanic)
Glassy/smooth small crystals usually not even
visible
large crystals coarse texture
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Where are igneous rocks likely formed/found near?

• Mid-ocean ridges
• Subduction zones
• volcanoes

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Types of Igneous Rocks
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Idioms and Expressions to Ponder
Heart of stone Head full of rocks Stuck between
a rock and a hard place
unaffectionate, unforgiving, cold
acted without thinking intelligently
in a situation where you have to make a decision
that has no good options or solution
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• Every rock tells a story about
• how it formed
• the environment where it has been
• what it has experienced
• Each of these stories is an adventure. We need to
  learn how to read a rock like we read a book.

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Roundness and Sorting
Roundness presence or absence of corners and
sharp edges Particles get rounder as they are
transported. Sorting - is a texture that
indicates how long the sediments have been in the
water system. Poorly sorted sediments show a
wide range of grain sizes well-sorted ones have
similar sized grains. Sorting increases with
transportation.
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High Energy
low energy
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