How are oceanic islands formed?
a) Hotspots form island chains as the overlying tectonic plate moves
b) Island arcs form at oceanic-oceanic convergent boundaries
c) Mid-ocean ridges form undersea volcanoes, which breach the surface of the ocean
d) All of the above
D
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Which of the following places is NOT a sovereign and independent state as of 2016?
A) New Caledonia B) Kiribati C) Papua New Guinea D) Fiji E) Tuvalu
When Eyjafjallajökull erupted in March 2010, ash plumes drifted southeast over Europe and, as a result, the controlled airspaces over many European countries were closed to air traffic,
stranding thousands of people worldwide. Why would flying a commercial jet through a cloud of volcanic ash be dangerous? A) Ash can impede visibility if thick enough. B) Hot ash will cause the plane to catch fire. C) Abrasion of windows and engine parts from ash. D) Engines can be clogged by ash. E) Ash impairs visibility, clogs engines, and abrades engine parts.
Zebra mussels ________
A) are presently restricted to the Great Lakes and Hudson River, but they are expected to spread rapidly in the near future B) are native to Canada C) excrete waste that facilitates algae blooms and subsequent eutrophication of lakes D) were introduced into the United States in the early 1900s E) are an invasive exotic species that clogs water intake pipes at factories, power plants, and wastewater treatment facilities
The figure above shows an upper-level 500 mb weather map drawn over North America. What can you expect about the temperature of the air column the star is located in?
a. I have not enough information to answer this question. b. The temperature is relatively low. c. The temperature is the same anywhere on this map. d. The temperature is relatively high.