Possible precursors of volcanic eruptions include
A. changes in composition of gases escaping from the volcano.
B. increased seismic activity.
C. bulging, tilt or uplift of the volcano's surface.
D. All of the choices are correct.
Answer: D
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Which statement about the difficulty of addressing climate change is false?
A. The problem is global. B. Humans are not hard-wired to respond to long-term threats. C. The problem is a long-term political issue. D. Proposed solutions are controversial. E. The benefits and harmful impacts are spread evenly.
The difference between active and passive remote sensing systems is that
A. active systems emit their own energy while passive systems simply detect existing energy signals. B. active systems can operate throughout cloud or fog cover while passive systems require clear sky conditions. C. active systems involve the latest generation of satellites while passive systems use signals from older satellites. D. active systems include aerial photography while passive systems rely on satellite imagery.
How has glacial ice aided the study of climate change?
A) Glacial ice contains trapped air bubbles that archive former atmospheric carbon dioxide concentrations. B) Glacial ice only exists where temperatures are exceedingly cold. C) Glacial ice flows only under its own weight, so studies of glacial ice reflect climatic conditions. D) Glacial ice stores water that would otherwise enter the oceans and cause sea level rise.
Suppose you read this description of an earthquake from the 1880s. "The ground shook so hard that books fell off the desk." Which scale would be most appropriate for this type of information?
A. Richter B. Moment C. Mercalli