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Answer the following question on your agree or
disagree sheet.What technology has
influenced your life the most? Why?
Objectives:
• Be able to define the purpose of the following technologies; dams, levees, aqueducts, irrigation, roads & bridges,
• Identify ways in which technologies have modified the physical environment.
How Have Technologies
Modified the Physical Environment?
• Technological innovations have been used by people to change the physical environment.
• Example: The use of steel plows allowed farmers to turn their land into productive farmland.
•NOT all changes in the physical environment
have been good!
1. Dam• A dam is a barrier across flowing
water that obstructs, directs or slows down the flow often creating a lake.
• Problems:– Ecology– Water temperature– Oxygen contenthttp://www.pbs.org/wgbh/buildingbig/dam/basics.html
Hoover Dam•Colorado River ran wild for years
•Grand Canyon
•Flooded farmland
•Drought
•Cattle died
•Crops were destroyed
2. Levee• The main purpose of a levee is to
prevent flooding of the adjoining countryside.
• Problem: They continue the flow of the river resulting in higher and faster water flow
• Levee Breach: Hurricane Katrina
3. Aqueducts:• An artificial channel that is
constructed to convey water from one location to another.
• The Colorado River aqueduct supplies the LA area with water.
4. Irrigation:• Is the artificial application of water to
the soil usually for assisting in growing crops.
• Problems:– Water pollution– Decrease of underground aquifers
5. Roads:• An identifiable route, way or path
between two or more places.
• Roads are typically smoothed or paved to prepare for travel. (They did not used to be!!!)
6. Bridges:• Is a structure built to span a gorge,
valley, road, railroad track, river, body of water, or any other physical obstacle.
http://www.pbs.org/wgbh/buildingbig/bridge/basics.html
REVIEW
1. How have levees along the Missouri River mainly affected the environment?
– A.) They have made the local water safe for drinking?
– B.) They have enabled fish to move upstream past dams.
– C.) They have generated electricity from the passing water.
– D.) They have protected the surrounding countryside from flooding.
D
1. How do people benefit from aqueducts?
– A.) They have warmed the water temperature.
– B.) They enable water to be channeled to other cities for use.
– C.) They protect the surrounding countryside from flooding.
– D.) They have polluted the water.
B
What is the purpose of a dam?
• A.) To retain water
• B.) To generate electricity
• C.) Obstruct, direct or slow down the flow of water.
• D.) All of the Above
D
Technology How did this technology modify the physical environment?
The Telegraph
Samuel F.B. Morse invented the telegraph. It worked by sending electrical signals over a wire. In his system known as the Morse code, each letter of the alphabet is represented by its own mix of signals. This invention allowed people to communicate across the country in a short time period. Before this invention their only form of communication was mail, which could take months.
“Ticket Out”
On a separate piece of paper answer the following question:
*Predict an invention that will
modify the physical world in the future. Be creative , but realistic!!!