Among the following radioactive parent isotopes, which has the shortest half-life?
A) uranium-238
B) potassium-40
C) rubidium-87
D) carbon-14
Answer: D
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What is the height (the relief) of the tallest dune?
The following questions are based on the portion of the “Kane Spring NW, California” quadrangle (scale 1:24,000; contour interval 10 feet) shown in Figure 46-6. These isolated dunes in the desert near the Salton Sea (33°11'02"N, 115°52'20"W) are moving over a surface that is only thinly covered with sand. To view this map in color, go to the Lab Manual website or scan the QR code for this exercise. What will be an ideal response?
This cross section shows the location of a septic tank with harmful bacteria and 5 wells. Which well is least likely to become contaminated?
A) Well A
B) Well B
C) Well C
D) Well D
E) Well E
Eutrophication is caused by ________
A) low pH B) low dissolved oxygen C) high turbidity D) mercury E) high levels of phosphorus
What type of weather front would likely be responsible for the following weather forecast? "Increasing high cloudiness and cold this morning. Clouds increasing and lowering this afternoon with a chance of snow or rain tonight. Precipitation ending tomorrow morning. Turning much warmer. Winds light easterly today becoming southeasterly tonight and southwesterly tomorrow."
a. dryline b. warm front c. stationary front d. dryline e. cold-type occluded front.