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Unit 04 Factors Impacting Earth Systems

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by

Misty Mitchell

on 25 January 2013

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Transcript of Unit 04 Factors Impacting Earth Systems

Test Review Earth - Our Constantly
Changing Planet Catastrophic Events Weathering, Erosion, &
Deposition in Ecoregions Watershed & Aquifers It is hard to imagine, but
Earth looks very different
than it did one million years
ago, and it will look very
different one million years
from now. Catastrophic events like tornadoes,
droughts, volcanoes, & floods change the land and water on earth as well as man-made structures. Weathering, erosion, & deposition are processes that continuously reshape Earth as well.
Perhaps the biggest cause for change on our planet is us! We mold and change the land to suit our needs many times not seeing how serious or impact is. We cut down trees and vegetation to build things, we drive cars that put pollution into the air, we use cleaning products & fertilizers that flow over watersheds into water supplies and soak into our aquifers.
The Earth will never stay the same. Many factors will continuously reshape it in different ways. In the first part of this unit we discussed how catastrophic events can negatively & positively affect Earth (and us). Weathering is BREAKING down Earth's surface!
Erosion is MOVING the sediment!
Deposition is DROPPING the sediment! A watershed is defined as any area of
land that catches water and drains it to
a certain point. Unit 04 Factors Impacting Earth Systems Citizens of Louisiana try
to escape floods caused
by the storm surge of
Hurricane Katrina. Satelight image of Hurricane
Katrina as it grows into a
Category 4 Hurricane. Droughts can quickly dry up drinking water for animals. Cast of one of the citizens of Pompeii. Chimney Rock in Nebraska helped settlers find their way to Oregon on the Oregon Trail. It was created by weathering, erosion, & deposition. This river was polluted by fertilizer from a nearby farm which caused the algae to grow too quickly. This aquifer is at risk! Fertilizers from the crops found here could infiltrate the ground to pollute the ground water. Impacts:
drowning
flooding
contamination of water
loss of habitat & homes
fires (from broken gas lines) Impacts:
no water for animals & plants (death)
land becomes desert
crop failure
increased wildfires
water shortages Impacts:
destruction of forests
no vegetation = EROSION
loss of habitats & homes
economic losses (money lost)
death Impacts:
drowning
flooding
mudslides or landslides
economic losses (money lost)
loss of habitats/homes Impacts:
death
landslides, rockslides & mudslides
earthquakes
fires
explosions
floods
tsunamis
ash affects breathing
contamination of water Impacts:
death
disease from contaminated water
loss of habitats & homes
crop destruction
livestock death Impacts:
loss of habitats & homes
death Impacts
breaks in the ground
liquification of the ground
landslides & avalanches
fires
tsunamis
loss of habitats & homes
death POSITIVE - Heat from wildfires help
conifer trees releas their seeds for reproduction! POSITIVE - After flood waters recede
(go away), they leave behind organic matter
that makes soil more fertile. Floods also
help trees like willows survive, and they
create new habitats for animals that like
a lot of water! Tsunami Flood Drought Tornado Volcano Earthquake Hurricane Wildfire Click here to see storm surge that happens during a hurricane! WED are processes that constantly reshape the Earth. We looked at how Texas is divided up into Ecoregions based on how the land has been affected by WED. We talked about how vegetation (plants) protect the soil from erosion. So in places like the desert, wind erosion affects the environment alot. We also looked at how water can carve out canyons in rock. This video shows how wind erosion affects the desert. This video shows how the Grand Canyon formed from the Colorado River. There are 2 types of weathering:
1. Chemical - causes a chemical change.
2. Mechanical causes a physical change Deposition also shapes the land. When a river meets a larger body of water like an ocean, it will slow down and drop the sediment it is carrying. This will eventually build up a river delta.
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