friday february 17, 2012
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Friday February 17, 2012. (Quiz 20). Launch Pad Friday, 2-17-12. No Launch Pad Today. Please turn in your Launch Pads for the week. Announcements. I will be available after school today until 4:45 . Latest News. None Today. Quiz 20. The Carbon Cycle and Sedimentary Rocks . - PowerPoint PPT PresentationTRANSCRIPT
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FridayFebruary 17, 2012
(Quiz 20)
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Launch PadFriday, 2-17-12
No Launch Pad Today.
Please turn in your Launch Pads for the week.
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Assignment Currently Open
Summative or Formative
Date Issued
Date Due
Date Into
Grade Speed
Last Day
Quiz 18 S5 2/3 2/3 2/3 2/17
WS – Igneous Rocks (Part 1) F 2/9 2/13
Quiz 19 S6 2/10 2/10 2/10 2/24
WS – Sedimentary Rocks (Part 1)
F 2/15 2/17
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AnnouncementsI will be available after school today
until 4:45.
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Latest News
None Today
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Quiz 20
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The Carbon Cycle and Sedimentary Rocks
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The Carbon Cycle and Sedimentary Rocks
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Stages in the Formation of
Coal
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Lithification of SedimentSedimentary rocks are produced through
the processes of lithification. Lithification occurs when loose sediments
are transformed into solid sedimentary rock.
Common lithification processes include:compaction
cementation by calcite, silica, or iron oxide
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Features of Sedimentary RocksAt the Earth’s surface, layer upon layer of sediment
accumulates.Each layer records the nature of the environment at
the time that layer was deposited.These layers, called sedimentary strata, or beds, are the most characteristic feature of sedimentary rocks.Separating the strata are bedding planes, flat surfaces
along which rocks tend to separate or break.Each bedding plane marks the end of one episode and
the beginning of another.
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Fossils in Sedimentary RocksFossils are the traces or remains of
prehistoric life, and are perhaps the most important inclusions found in some
sedimentary rocks.Fossils help to determine past
environments, are used as time indicators, and are useful for matching rocks from
different places.
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WorksheetSedimentary Rocks
(Part 2)
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The Launch PadThursday, 1/27/11
Define the terms “sedimentary strata” and “bedding plane.”
Each layer records the nature of the environment at the time that layer was deposited. These layers, called sedimentary strata, or beds.
Separating the strata are bedding planes, flat surfaces along which rocks tend to separate or
break. Each bedding plane marks the end of one episode and the beginning of another.
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LabSedimentary Rocks
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The Launch PadFriday, 1/28/11
Name the following sedimentary rocks.Conglomerate
BrecciaSandstoneShale
CoquinaCoal
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Metamorphic Rocks Metamorphic rocks are those that have changed their form
due to external environmental issues.Metamorphic rocks are produced from preexisting igneous,
sedimentary, or even other metamorphic rocks. Metamorphism takes place where preexisting rock is subjected to temperatures and pressures unlike those in which it formed.
There are different degrees of metamorphism which can be seen in the rock’s texture and in its mineralogy.
An example of low-grade metamorphism is shale becoming slate.
In high-grade metamorphism, obliteration of the rock’s original features occurs.
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Metamorphic Rocks Most metamorphism occurs in one of two settings:
When rock is intruded by a magma body, contact, or thermal metamorphism may take place.
Here, change is driven by a rise in temperature within the host rock surrounding a molten igneous body.
During mountain-building, great quantities of rock are subjected to directed pressures and high
temperatures associated with large-scale deformation called regional metamorphism.
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What Drives Metamorphism?
The driving agents of metamorphism include heat, pressure (stress) from burial (confining pressure) or from differential stress during mountain
building, and chemically active fluids (mainly water and other volatiles.)
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Pressure as a Metamorphic Agent
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Metamorphic TexturesThe degree of metamorphism is reflected in the
rock’s texture and mineralogy.When rocks are subjected to low-grade
metamorphism, they become more compact and more dense (like slate.)
Under more extreme conditions, stress caused certain minerals to re-crystallize. Consequently,
many metamorphic rocks consist of visible crystals, much like coarse-grained igneous
rocks.
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Metamorphic TexturesThe crystals of some
minerals will recrystallize with a
preferred orientation, essentially
perpendicular to the direction of the
compression force.
The resulting mineral alignment usually gives
the rock a layered or banded appearance
termed foliated texture
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Metamorphic TexturesSome metamorphic rocks have a
nonfoliated texture.
Metamorphic rocks composed of only one mineral that forms
equidimensional crystals are, as a rule, not visibly foliated (examples:
limestone and marble.)
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Common Metamorphic Rocks
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Classification of Metamorphic Rocks
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Worksheet
Metamorphic Rocks
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The Launch PadMonday, 1/31/11
Name the following metamorphic rocks.slate
marble
schist
anthracite
phyllite
gneiss
quartzite
foliated
nonfoliated
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LabMetamorphic Rocks
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Classification of Metamorphic Rocks