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Daily Warm-Up Exercises 1
Day 2When someone says a rock has fine grains or coarse grains, what are they talking about?
Grains are the particles that make up a rock. The words fine and coarse refer to the size of the grains. Fine grains are small, and coarse grains are larger.
What is molten rock?Molten rock is melted rock.
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Trilobite Hunter, Part 2
Introduction to the Grand CanyonEarth History, Investigation 8
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Return to Trilobite HunterAre igneous rocks good for finding trilobite fossils?
No, because they are made of molten rock, which is much too hot to preserve organisms.
granite pumice
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Return to Trilobite Hunter
We are now going to look at a second type of rock, called metamorphic. We’ll find out if metamorphic rocks are good for finding fossils.
These rocks are found in some of the deepest layers of the Grand Canyon.
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Compare Rock Types
Contrasting Case Activity 1, Part 2Earth History, Investigation 8
Compare Rock Types
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List Observable Features
Metamorphic #1
Metamorphic #18
List the features you can observe about the two metamorphic rock samples.
Compare Rock Types
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Which is Which?
Can you figure out which rock is schist and which is quartzite?
1
18
Compare Rock Types
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What’s the Same? What’s Different?
Identify similarities and differences and write them in the Venn diagram.
Compare Rock Types
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Compare Rock Types 9
Metamorphic
Schist OnlyBoth Schist & Quartzite Quartzite Only
Fairly shiny
Medium to coarse grain size
Formed from slate, a metamorphic rock
Crystals are flat and arranged in layers
Made of minerals
Formed when a rock changes due to heat and/or pressure
Formed deep beneath Earth’s surface
Dull and hard
Fine grain size
Formed from sandstone, a sedimentary rock
Rough
Grains appear to be fused together
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Return to Trilobite HunterAre metamorphic rocks good for finding trilobite fossils?
Not very good because the heat and/or pressure will usually destroy any fossils contained in the original rock.
schistquartzite
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Return to Trilobite Hunter
Let’s look at one more type of rock, sedimentary. We’ll find out if sedimentary rocks are good for finding trilobite fossils.
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Compare Rock Types 12
List Observable Features
Sedimentary #7
Sedimentary #8
List the features you can observe about the two sedimentary rock samples.
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Compare Rock Types 13
Which is Which?
Can you figure out which rock is shale and which is sandstone?
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8
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What’s the Same? What’s Different?
Identify similarities and differences and write them in the Venn diagram.
Compare Rock Types
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Compare Rock Types 15
Sedimentary
Shale Only Both Shale & Sandstone
Sandstone Only
Smooth
Very fine grain size
Grains are arranged in layers
Formed from particles of silt or clay
May contain fossils
Made of minerals
Formed when something gets compacted and cemented together
May form on or below Earth’s surface
Rough
Medium to coarse grain size
Formed from grains of sand
Dull and hard