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Compare Rock Types

Day 3
by

Summer Roland

on 29 May 2014

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Transcript of Compare Rock Types

Day 3 - Compare Rock Types
What is the same and different about sand, silt, and clay?
They are all made up of a lot of small grains, but the size of the grains is different. Silt has much finer grains than sand, and clay grains are very, very fine.
What are grains?
Grains are the particles that make up a rock.
Granite Only
Pumice Only
Both Granite & Pumice
- Formed when molten rock cools and hardens.
- Rough and dull.
- it is hard and has shiny, smooth crystals.
- Most grains are coarse.
- Usually fairly light in color.
- Made of minerals.
- Formed deep beneath Earth's surface.
- Usually feels lighter than other rocks of its size.
- Grain size is fine to medium.
- Contains a lot of small air pockets.
- Made of volcanic glass.
- Formed on Earth's surface from molten rock released by a volcano.
Schist Only
Quartzite Only
Both Schist & Quartzite
- Fairly shiny.
- Medium to coarse grain size.
- Crystals are flat and arranged in layers.
- Formed from slate, a metamorphic rock.
- Dull and Hard.
- Fine grain size.
- Grains appear to be fused together.
- Formed from sandstone, a sedimentary rock.
- Rough.
- Made of minerals.
- Formed when a rock changes due to heat and/or pressure.
- Formed deep beneath Earth's surface.
Shale Only
Sandstone Only
Both Shale & Sandstone
- Dull and hard
- May contain fossils.
- Formed when something gets compacted and cemented together.
- May form on or below earth's surface.
- Smooth.
- Very fine grain size.
- Grains are arranged in layers.
- Formed from particles of silt or clay.
- Rough.
- Medium to coarse grain size.
- Formed from grains of sand.
- Made of minerals.
Is there anything that all three rock types have in common?
No, there is nothing in common between all three rock types.
Is there anything that two of the three rock types have in common?
Metamorphic and sedimentary rocks are both made of minerals.
Look at your igneous diagram.
Are either of these rocks, granite or pumice, made of minerals?

Yes, granite is made of minerals, but pumice is not.
What can we then conclude from this?
Most rocks are made of minerals.
Triple Venn
Igneous
Metamorphic
Sedimentary
- Most are made of minerals.
Is there anything else that is true about two rock types but not true about the third?
Igneous and sedimentary rocks may form on or below Earth's surface.
Metamorphic rocks only form below the surface of earth.
How would you show this in the diagram?
- May form on or below Earth's surface.
- Only forms below Earth's surface.
Fill in the diagram by entering at least one feature that is true about igneous rocks only.

Do the same for metamorphic and sedimentary rocks.
- Forms when molten rock cools and hardens.
- Forms when a rock changes due to heat, pressure, or both.
- Forms when something gets compacted and cemented together.
Based on your diagram, what do most rocks have in common?
They are made of minerals.
Suppose a previously unknown rock is discovered, and scientists categorize it as sedimentary.
What can you say about this rock?

An unknown rock discovered and named as sedimentary by a scientist, was probably formed with something got compacted and cemented together. It could have formed on or below Earth's surface. It may contain fossils.
Drawing Conclusions:
Drawing Conclusions:
Drawing Conclusions:
Suppose the scientist categorize the unknown rock as metamorphic. What can you say about it then?
If the unknown rock was categorized as metamorphic the rock probably formed deep beneath Earth's surface, when a rock changed because of all the heat, pressure, or both heat and pressure inside of Earth.
Drawing Conclusions:
What if the scientist categorized the unknown rock as igneous? What can you say about it then?
You could say the unknown rock formed when molten rock cooled and hardened. It could have formed on or below Earth's surface.
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