Transcript Weathering, Erosion, Deposition: Effects on the Texas


In the natural world, enviroments
are characterized by:
Types of soil
 Precipitation
 Temperature
 Land features
 Vegetation
 Animal wildlife

We have:
 Analyzed the characteristics of the
ecoregions of Texas
 Investigated processes that change
the surface of the Earth
 Explored how the process of
weathering, erosion, and
deposition have affected the
environments in Texas ecoregion.
ENCHANTED ROCK
LOCATED IN CENTRAL TEXAS
WHAT’S HAPPENING?



Exfoliation – mechanical
weathering has caused the rock
to “peel” in sheets. This was
caused by contracting and
expanding during heating and
cooling in the temperature
Mechanical or chemical
weathering? What station?
The weathering of sedimentary
rock has exposed the granite
dome underneath
Other types of mechanical
weathering present – plant roots
RAINWATER MIXES WITH CARBON
DIOXIDE IN THE ATMOSPHERE AND
SOILS TO FORM CARBONIC ACID
(H2CO3), WHICH ACTS TO DISSOLVE
AWAY LIMESTONE.
Georgetown-
Inner Space Cavern



One of the windiest
regions in the US
Low vegetation, so
high wind erosion
Which station activity most
closely models the formation of
Palo Duro Canyon?
Palo Duro Canyon
was formed by water
erosion by a fork in
Red River that
continues to become
deeper
Big Bend– erosion from water
flow from the
Red River
Davis Mountains –
formed from volcanic activity
Guadalupe Mountains –
formed by fossilized coral reef
Big Bend–
Ancient swamp,
current desert
Big Bend - the warm red and brown
colors of igneous rocks show
oxidation, oxygen reacting with
iron forming rust
Big Bend– limestone cliff eroded by
carbonic acid
Water droplets capture
carbon dioxide to form carbonic acid
Which station models this
erosion of the limestone
cliffs?

Due to ample precipitation
and abundant vegetation
that holds the soil in place,
there is very little erosion
Thick
vegetation
near rivers
inhibits river
erosion.
Which station activity most closely
models seasonal flooding?
Wave action, a cause of weathering, erosion
and deposition, is constant along the Texas
Coastline.
Sediments are weathered and eroded along
beaches and carried out into the ocean to
form sand bars and islands
Galveston Beach
Mustang Island was
formed by erosion and
deposition
Sand dunes in
Padre Island
When rivers, like the Brazos enter the Gulf of Mexico
sediment being carried by the river stop moving and get deposit causing a delta.
Before Katrina
After Katrina
Which station
activity most
closely models
the effects of a
hurricane on the
Gulf Coast?
Justify your
answer.
After Katrina