Mrs. Giorgianni/Physical Setting Earth Science
UNIT III: EARTH’S MATERIALS AND GEOLOGIC HISTORY
Main Concepts/Ideas:
 Matter is made up of particles whose properties determine their characteristics.
 Minerals have physical properties determined by the internal arrangement of their atoms.
 Rocks are composed of one or more minerals; the type of rock formed is determined by its origin.
 Geologic History can be reconstructed by observing fossils and correlations in the rock record.
 The age of rock materials is determined by analyzing the regular of decay (half life) of radioactive isotopes.
Key Questions:
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How are minerals identified; and what gives them specific characteristics?
What are the three main types of rocks and how does each of them form?
How can we use the rock record to determine the relative age of rock outcrops?
How are radioactive isotopes used to calculate the absolute age of rock materials?
When did Earth begin to have an oxygen-rich atmosphere? Why?
Vocabulary:
Minerals
Chemical Composition
Chemical Properties
Cleavage
Crystal
Fracture
Hardness
Luster
Streak
Igneous Rocks
Extrusive/Volcanic
Felsic
Intrusive/ Plutonic
Mafic
Texture
Volcano
Sedimentary Rocks
Cementation
Clastic
Composition
Crystalline Structure
Evaporites
Fossils
Organic
Metamorphic Rocks
Banding
Foliated
Intrusion
Regional
Metamorphism
Contact Metamorphism
Rock Cycle
Classification
Process
Event
Formation
Geo History
Correlation
Half-life
Index Fossil
Unconformity
Lab Activities:
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Lab Safety
Observing Earth Materials
Mineral Identification
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Igneous Rocks
Sedimentary Rocks
Metamorphic Rocks
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Sequence of Events
Matching Rock Layers
Radioactive Decay
Homework Assignments:
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Week #8: Vocab: Minerals/Igneous Rocks, Castle Learning due Sunday, October 26
Week #9: Vocab: Sed Rocks/Met Rocks; Castle Learning due Sunday, November 2
Week #10: Vocab: Rock Cycle/Geo History; Castle Learning due Sunday, November 9
Week #11: Castle Learning due Sunday, November 16
Quizzes/Unit Test:
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Vocab quizzes may be given weekly based on the previous week’s vocabulary assignment.
Quizzes may be given after each sub-unit:
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Minerals
Igneous Rocks
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Sedimentary Rocks
Metamorphic Rocks
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Correlation
Radioactive Decay
Earth Materials/Geologic History Unit Test will be on or around Friday, November 14
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The DATE is tentative, the TEST is not!
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25 Multiple choice questions – BRING A PENCIL
o 5 Short answer questions
Obstacles are those frightful things you see when you take your eyes off your goals.
~ Abraham Lincoln
Giorgianni ~ Unit III Outline 2014/2015
UNIT 1: EARTH MATERIALS/GEOLOGIC HISTORY
Main Concept Review
Minerals and Rocks
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Minerals are identified by color, luster, streak, and crystal structure.
Cleavage is determined by the internal arrangement of atoms.
Density is Mass/Volume, and helps determine the identity of a mineral. V=M /D.
The hardness of glass is about 5.5
The last page of ESRT has a mineral chart, including characteristics and uses of minerals.
Note that the chart is divided into metallic and non-metallic minerals.
Igneous rocks solidify from molten material, quickly with small or invisible crystals at the surface
(extrusive) or larger crystals inside the earth, (intrusive).
Igneous minerals are Mafic (dark) or felsic (light). See ESRT.
Sedimentary rocks are formed from various sized sediments, and are classified on ESRT.
Sedimentary rocks can form from deposition, burial, compaction, cementation OR precipitation.
Deposition of various sediments, and therefore the formation of rocks, relates to water velocity.
Obsidian is a glassy FELSIC igneous rock formed quickly at the earth’s surface. Pumice also forms this
way, with air pockets within.
Recrystallization and foliation are terms associated with metamorphic rocks.
Metamorphic rocks are sometimes banded or very dense.
Metamorphic rocks form from Heat and Pressure, either very deep within the earth (regional) or in
contact with igneous intrusions (contact).
It’s very important that you can use the rock ESRT’s for the three types.
There is also a rock cycle ESRT, showing how rocks can change from one type to another.
The only type of rock that contains fossils is sedimentary.
Parent rocks are the rock type from which a metamorphic rock comes from. Again, read ESRT!
Geologic History
20. The earth is approximately 4.6 billion years old, which is approximately the same as the half-life of
Uranium.
21. The Geologic Time scale is based on fossil evidence. So is the theory of Evolution.
22. The Precambrian Era is sooo long compared to the others. The Cenozoic is pretty darn short. Humans
have been around for far less the 1% of Earth History.
23. Half-life means the amount of time it takes for half of a sample of radioactive atoms to decay. Can you
solve problems on this, and understand line, pie, or bar graphs?
24. Index fossils exist for a SHORT period of time, over a WIDE area.
25. Earth’s atmosphere began to have oxygen about 2 billion years ago during the early proterozoic as a result
of photosynthesis in simple bacteria.
Giorgianni ~ Unit III Outline 2014/2015