Question

10 multiple choice 2 points
why do humans modify their environment through projects like building dams?
to reduce the availability of water
to increase the risk of natural disasters
for entertainment purposes only
to control water resources for electricity, irrigation, and flood control
11 multiple choice 2 points
of the following, which group would most likely be located on level land?
hydroelectric plant, national park, reservoir
orchard, coffee plantation, mine
amusement park, ski resort, quarry
railroad, city, airport
12 multiple choice 2 points
which is the main reason that many early peoples settled in river valleys?
river valleys tended to be cooler than highland regions.
river valleys were virtually free of danger from wild animals.
river valleys were easier to defend from attack than were highland regions.
river valleys were fertile because floodwaters left rich soil on the banks.

Explanation:

• Question 10: Dams are built to manage water resources. Reducing water availability (first option) is counter - intuitive. Increasing natural disaster risk (second option) is a negative consequence, not a purpose. Entertainment (third option) is not the main reason. Controlling water for electricity, irrigation, and flood control (fourth option) is correct.
• Question 11: Railroads need flat land for tracks, cities develop on flat land for easier construction and infrastructure, and airports need flat land for runways. Hydroelectric plants often need a height difference (first option). Orchards and coffee plantations can be on slopes (second option). Ski resorts need slopes (third option).
• Question 12: Early civilizations were agrarian. River valleys had fertile soil due to floodwaters (fourth option). River valleys were not necessarily cooler (first option), not free of wild animals (second option), and not easier to defend (third option) compared to highlands in terms of natural defense.

Answer:

1. To control water resources for electricity, irrigation, and flood control
2. Railroad, city, airport
3. River valleys were fertile because floodwaters left rich soil on the banks.