The explosions at the Fukushima Nuclear Power Plant in northeast Japan following damage by an offshore earthquake blew the roofs off of three of the reactor buildings. The explosions were caused
a. presumably by a meltdown of the reactor cores.
b. presumably by steam from the heat exchangers inside the reactor cores
c. presumably by a buildup of hydrogen gas when the backup generators were disabled
d. terrorists taking advantage of the chaos of the situation
e. spent fuel rods that were exposed when the storage water tanks cracked and stopped cooling the rods
C
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Detrital zircon from sedimentary rocks found in Australia yields an age of 4.4 billion years, which indicates that rocks
formed on Earth at least 4.4 billion years ago. a. True b. False
In areas of Mediterranean climate we find a mixed woodland and grassland that consists of relatively small trees
Indicate whether the statement is true or false.
The ________ is (are) characterized by terrane accretion that has been active throughout most of Mesozoic and Cenozoic time
A) southern margins of India and Australia B) western margin of the Mid-Atlantic Ridge C) western margin of North America D) western margin of Africa
A stream begins at an elevation of 200 meters and flows a distance of 400 kilometers to the ocean. What is the average gradient?
a. 0.5 km/in b. 2 km/m c. 0.5 m/km d. 2 m/km