Although hydroelectric dams generate electricity without producing greenhouse gases, they
A) are short-lived structures that have to be rebuilt about every 20 years.
B) are only able to contribute to about 5% of the electrical power throughout the world.
C) alter water control in ways that make irrigation of crops more difficult.
D) eliminate farmland and wildlife habitats and often villages in the regions that are flooded.
D
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Biologists conservatively estimate that the current extinction rate is at least ____________________ times the normal background extinction rate.
Fill in the blank(s) with the appropriate word(s).
________ is a sedimentary rock formed mechanically from fine silt and clay particles
A) Granite B) Basalt C) Limestone D) Shale E) Sandstone
Which of the following is NOT a goal for smart growth?
A. Make the downtown area vital and livable B. Each resident is responsible for growing his/her own food C. Create a positive self-image for the community D. Improve community access to the arts E. Improve communications
What are the major differences between the Nomadic Warrior and Sedentary Farmer theories in explaining the origins of Proto-Indo-European speakers?
A) The Nomadic Warrior Theory suggests that Kurgans migrated to set up trade routes and the Sedentary Farmer Theory suggests that Indo-European diffused into Europe and South Asia by military conquest. B) The Nomadic Warrior Theory suggests that Kurgans largely migrated northward in search of grasslands and the Sedentary Farmer Theory describes migration to the south. C) The Nomadic Warrior Theory suggests that Kurgans migrated by means of military superiority and the Sedentary Farmer theory describes much earlier people that diffused into Europe and South Asia along with agricultural practices. D) Kurgans migrated to present day Spain by 3500 B.C, but the people described by the Sedentary Farmer Theory were already in Spain at that time. E) Kurgans were the first Proto-Indo-European speakers according to the Nomadic-Warrior Theory. According to the Sedentary-Farmer Theory, the Kurgans never existed.