After a uranium fuel rod reaches the end of its fuel cycle (typically 3 years) most of its energy comes from the fissioning of plutonium because
A) fissionable Pu-239 is formed as the U-238 absorbs neutrons from the fissioning U-235.
B) fissionable Pu-239 is formed as the U-235 absorbs neutrons from the fissioning U-238.
C) fissionable Pu-239 is formed as the U-238 absorbs alpha particles from the fissioning U-235.
D) fissionable Pu-239 is formed as the U-235 absorbs alpha particles from the fissioning U-238.
A
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All crossopterygians went extinct at the end of the Cretaceous. Indicate whether the statement is true or false
The bottom of the euphotic zone is where
1.there’s no more light at all, unmeasurable.
2.there’s insufficient light for any photosynthesis to occur.
3.use of carbohydrates in respiration equals their photosynthetic production.
4.phytoplankton respiration is zero.
The first scientific expedition to use an echo sounder was the ____
A) ?Challenger expedition B) ?Meteor expedition C) ?United States Exploring expedition D) ?voyage of Trieste
Ice in a retreating glacier
A) remains stationary. B) moves downslope. C) moves upslope. D) may move downslope or upslope.