The most recent warming trend experienced over the Northern Hemisphere could be the result of ____
A) light colored particles in the stratosphere
B) increasing levels of greenhouse gases
C) a decrease in the energy emitted by the sun
D) an observed decrease in snow cover
B
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Which of the following statements best describes why a large nucleus is more likely to undergo radioactive decay?
A. The nuclear forces are not as strong as the repulsive electrical forces between nucleons. B. The proton-proton repulsion cannot overcome the nucleon attraction. C. All nuclei are equally likely to undergo radioactive decay. D. The nucleon-nucleon attraction is stronger than the proton-proton repulsion. E. The nuclear force between the nucleons are very strong and squeeze out other nucleons.
Using a refillable beverage container (returnable bottles) would be an example of ________ materials.
A. Redefining B. Reusing C. Reducing D. Recycling E. None of these is correct
The slopes of most cinder cones are usually about 30 degrees because ________
A) they are composites of loose material and lava and the viscosity of the lava requires the slopes to form at about 30 degrees B) cinder cones are mostly basalt and basalt is too weak to maintain a slope greater than 30 degrees C) the loose materials ejected from the cone form slopes at the angle of repose D) The statement is false; most cinder cones have slopes less than 10 degrees because of the low viscosity of basalt lava flows.
If groundwater mining were to immediately cease, how long do scientists estimate recovery of the High Plains Aquifer would take?
A) under 25 years B) between approximately 50 and 75 years C) a minimum of 100 years and a maximum of 500 years D) at current recharge rates 750 years E) at least 1,000 years