Why is the margin of the Pacific Ocean called the "Ring of Fire"?
a) The Pacific Plate borders many convergent boundaries around the rim, which has active volcanoes and earthquakes
b) The Pacific Plate is getting larger and is surrounded by ridges
c) Hotspots surround the Pacific Plate
d) The "Ring of Fire" is folklore, and the rate of earthquakes is the same everywhere
A
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Although coal is an abundant fuel, when burned it produces very high _____________________ emissions.
Fill in the blank(s) with the appropriate word(s).
Producing a gasoline substitute in a natural gas-powered ethanol plant results in more greenhouse
gases than the equivalent amount of gasoline. Indicate whether the statement is true or false.
Sedimentary rocks include
A. chemical precipitates (halite, gypsum). B. organically precipitated components cemented together (shells cemented to form limestone). C. organically formed materials compressed together (partially decomposed plant material formed into lignite or coal). D. pieces of other rocks cemented together (sandstone, shale). E. All of the choices are correct.
If a nucleus of 
Th absorbs a neutron and the resulting nucleus undergoes two successive beta decays (emitting electrons), what nucleus results?
A. thorium-233 B. plutonium-232 C. uranium-233 D. americium-232