Briefly discuss the pros and cons of hydropower
What will be an ideal response?
Hydropower is renewable and clean; it produces enormous amounts of energy with little air pollution. Fossil fuels are used in the construction and maintenance of dams, however, and recent evidence suggests that reservoirs release some methane, a greenhouse gas. Damming rivers destroys habitat because it floods areas above dam sites and reduces water flow below dam sites. Dams disrupt flooding cycles of rivers, affect the dynamics of estuaries and prevent floodplains from receiving nutrient-laden sediments. Dams also cause thermal pollution that kills native fish. They block the passage of fish and other aquatic organisms within the ecosystem, fragmenting rivers and reducing biodiversity. These concerns require that extensive environmental impact studies be made prior to undertaking a hydropower project.
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Which of the following soil horizon designations is i the correct sequence from the surface to the bedrock?
A) O, E, C, B, A B) A, B, C, O, R C) S, O, I, L D) O, A, E, B, C
Longwaves in the middle and upper troposphere usually have lengths on the order of
a. a few kilometers. b. tens of kilometers. c. hundreds of kilometers. d. thousands of kilometers. e. millions of kilometers.
Why do you think that most cetaceans use sound for communication and echo-location?
a) Sound travels farther through water than light b) The ancestors of these organisms had vocal chords, so they adapted to project sound in water c) Cetaceans have ears so they can hear sounds that fish cannot d) Cetaceans have developed a simple language for communication e) Cetacean skulls are specially adapted for sound transmission
Rills are ____
A)steep slopes where soils form slowly B)flat areas where soils form slowly C)rocky areas where soil formation is difficult D)shallow enough to be eliminated by plowing E)too deep to be eliminated by plowing