Which of the following radioactive isotopes would be best for age-dating a rock from 50,000 years ago?
A) uranium-238
B) carbon-14
C) potassium-40
D) thorium-232
Answer: B
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What is the rank these food production systems in order of proportion of the world's food supplied from biggest to smallest?
A. cropland, rangeland, and fisheries B. rangeland, cropland, and fisheries C. fisheries, rangeland, and cropland D. cropland, fisheries, and rangeland E. rangeland, fisheries, and cropland
What is the name of the water transfer system that has enabled the relatively dry San Joaquin Valley to be the nation's largest producer of fruits and vegetables?
What will be an ideal response?
Which mechanism is steadily slowing Earth's rotation?
a. The deep sea currents b. The thermohaline circulation c. The tidal friction d. The gravitational force
Sinkholes are triggered when the groundwater level rises.
a. True b. False