Box 4 Read pages 131132 in your textbook Answer the following questions 1 What factors influence the rates of weathering 2 In what climate would you find faster rates of weathering Erosion ID: 311257
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Slide1
Bellwork
:
Box #4
Read pages 131-132 in your textbook
Answer the following questions
1) What factors influence the rates of weathering?
2) In what climate would you find faster rates of weathering?Slide2
Erosion
Erosion is:
The _________ of all weathered sediment and rock materialSlide3
1. Ice Erosion
Ice picks up and drags rocks as it moves. (i.e- Glaciers)Slide4
2. Water Erosion
Water transports material by rivers, streams, lakes, and ocean wavesSlide5
…more Water ErosionSlide6
…even more Water ErosionSlide7
3. Gravity Erosion
Rocks and sediment travel down slope by gravitySlide8
4. Wind Erosion
Wind transports sediment and small particles erodes existing rocksSlide9
… more Wind ErosionSlide10
Resistant vs. Non- Resistant
Usually Igneous Rocks and Metamorphic Rocks are stronger than Sedimentary rocks.
Think about how they form!Slide11
Awesome website
http://mail.colonial.net/~hkaiter/weatheringerosiondeposition.htmlSlide12
The Result
of
Weathering
&
Erosion
is…Slide13
SOIL!Slide14
Soil!
Definition
: A natural body that exists as a
mixture
of minerals, water, dead organic matter, gases & liquids, and living organismsSlide15
Composition of Soil:Slide16
Soil Development
As rocks
weather
and erode
,
they form different layers of soil that scientists call
horizons.Slide17
R Horizon = Bedrock
Solid,
unweathered
and unbroken body of rock.Slide18
BedrockSlide19Slide20
C Horizon= Parent Rock
Regolith =
A layer of weathered and broken rock fragments
(covers much of Earth’s surface)Slide21
C Horizon= PARENT ROCKSlide22
B Horizon= Subsoil
contains large amounts of
minerals and clay
and
lacks organic
material.
Ex:
Al, Fe,
Clay
, and QuartzSlide23
B Horizon= SUBSOILSlide24
A Horizon = Top Soil
mixture of organic matter and mineralsSlide25
A Horizon = Top SoilSlide26
O Horizon = Humus
Organic material, remains of animals and plants (leaf litter)Slide27
Humus:Slide28
Soil
Horizons
Humus
Topsoil
Subsoil
Parent Rock- Regolith
Bedrock
Slide29
Soil profile:
A
cross-section
in which all the horizons of soil and bedrock can be seen
In fully developed soils, there are
three
horizonsSlide30Slide31
Soil profile:
Each profile is different due to different bedrock and weathering conditionsSlide32
TOPSOIL
SUBSOIL
HUMUS
BEDROCK
PARENT ROCKSlide33
Properties of SoilsSlide34
Soil Texture:
There are
3
main textures that are types
classified by particle size
(grain size)Slide35
Soil Texture
Clays:
less than
.0002 mm
in diameter (feldspar)
Very
fine grainedSlide36
CLAYSlide37
Soil Texture
2) Silts:
between
.0002mm - .06mm
Medium Grain SizeSlide38
SILTSlide39
Soil Texture
3) Sand:
between
.06mm – 2 mm
(granite)
larger grain sizeSlide40
SANDSlide41
Soil Texture
Differences
in texture influence a soil’s
ability to support plantsSlide42
Parent material
or “parent rock”
is the rock from which the soil was weathered.
The
portions
of clay, silt, and sands
depends
on parent
rockSlide43Slide44
Soil Texture Diagram
Loamy
soils are the best for growing plantsSlide45
A
B
C
Topsoil
Subsoil
Parent Rock
Humus
O
_
Horizon
_
Horizon
_
Horizon
_
Horizon