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EXTRA CREDIT 30 POINTSMax
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Attend one of the events that is part of the 13th Annual Celebration of Our ... 3 sessions at Earth Science Week: Sunday Oct 8th through Friday Oct 13th. ... – PowerPoint PPT presentation
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Title: EXTRA CREDIT 30 POINTSMax
1
EXTRA CREDIT - 30 POINTS(Max)
- Due Monday November 6th
- Either
- Attend one of the events that is part of the 13th
Annual Celebration of Our Mountain Festival. For
the full schedule go to http//www.celebrationof
ourmountains.org - Or
- 3 sessions at Earth Science Week Sunday Oct 8th
through Friday Oct 13th. - Submit the cover page and your description
(stapled together) in class Monday, November 6th.
NO LATE SUBMISSIONS WILL BE ACCEPTED. - Signature of Field Trip/Session Leader
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RocksGeology 1303Earth Science
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- What is a rock?
- How does a rock form?
- What is/are the origin(s) of a rock?
- Who cares? Why?
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Definition of a Rock
- Made of minerals
- Firm and coherent
- Aggregate of materials
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A Rock is anAggregateof Minerals
Quartz
Amphibole
Feldspar
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Why Study Rocks?
- Economic value.
- Earth processes (volcanic eruptions, mountain
building, weathering, earthquakes etc.) depend on
the properties of rocks. - Contains clues about the past environment and
early Earth history. - Rocks are storytellers. They are a record of
events that happened in the past
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Components of a Rock
- Clasts (fragments) or crystals large enough to
see the individual pieces - Matrix - fine-grained material between larger
clasts or crystals - Cement - crystalline added after the original
rock formed (usually by water ) - Not every rock will have all 3 components!
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- Exam-1 on Wednesday
- Continue with rock cycle
- Start Next Topic
- Igneous rocks
- (review of volcanoes and Plutons)
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The Rock Cycle
- Rocks are divided into three groups based on
their mode of origin - igneous,
- metamorphic,
- sedimentary.
- Rock types linked by processes that act on and
within the Earth.
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Rock Cycle (Basic)
- Magma (molten rock)
- crystallizes (cools and solidfies) at or near the
surface to form igneous rocks
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Rock Cycle (Basic)
- A rock, exposed at the surface undergoes
- weathering
- disintegration of rock due to chemical/mechanical
action, - transportation or erosion
- sediment moves downhill by gravity and taken
somewhere else by wind or water,
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Rock Cycle (Basic)
- A rock, exposed at the surface undergoes
- deposition
- -comes to rest somewhere - in an ocean, river
floodplain, swamp, sand dune etc., and - lithification
- conversion into rock through compaction and
cementation and forms a sedimentary rock.
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Rock Cycle (Basic)
- A rock at or near the surface is buried to great
depth and is subjected to - intense heat (due to magma nearby?) or
- pressure (due to mountain building)
- The rock reacts to this change of environment by
becoming a metamorphic rock.
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Alternate Paths
- The full rock cycle does not always take place.
Some "short cuts" are - Sedimentary rock melts.
- Igneous rock is metamorphosed.
- Sedimentary rock weathers.
- Metamorphic rock weathers.
Igneous Rocks
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RockCycle(2)
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Clasts
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Clasts Matrix
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Clasts Cement
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Igneous Rock
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Sedimentary Rock
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Metamorphic Rock
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A flash flood in Las Vegas NV
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