A key option during the transition from oil to renewable energy sources is
A. coal.
B. nuclear energy.
C. biomass.
D. natural gas.
E. ethanol.
Answer: D
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When Freddy Frog drops vertically from a tree onto a horizontally-moving skateboard and doesn't slip off, it is likely due to
A. inertia in motion. B. impulse. C. friction between his feet and the board. D. momentum change.
Since 1945, approximately ____ species of insects and rodents have developed resistance to one or more insecticides
a. 50 b. 500 c. 1,000 d. 2,000 e. 5,000
________ are long, linear scratch marks carved onto bedrock by glacial abrasion
A) Eskers B) Glacial troughs C) Glacial striations D) Hanging valleys
The figure above shows an upper-level 500 mb weather map drawn over North America. Where do you expect the highest wind speeds to occur?
a. no difference between 1 and 2 b. 2 c. 1