In infrared-enhanced images, clouds with the coldest (highest) tops are typically assigned the colors ____ or ____
a. black; dark grey
b. orange; yellow
c. light green; dark green
d. dark blue; red
e. light grey; white
ANSWER: d
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Why might the following nuclear reaction not be very good for energy production in a fission reactor? U ? Th + He + 3 neutrons
A) The material only produces a few neutrons so the chain reaction will not be very efficient. B) The reactants are too small to obtain much energy from the missing mass due to the strong nuclear force. C) The products are not the right size to obtain much energy from missing mass due to strong nuclear force. D) The mass of the byproducts is too high and therefore the energy released will not be large enough. E) Interatomic attraction between the products will impede the separation of the atoms from the unstable nuclei.
Most biological productivity in the ocean occurs in the euphotic zone
Indicate whether the statement is true or false
Judge the following sentence according to the criteria given below: Clown fish are stung by sea anemone but are not seriously harmed BECAUSE they are immune to the toxins in the stinging tentacles
A) The assertion and the reason are both correct, and the reason is valid. B) The assertion and the reason are both correct, but the reason is invalid. C) The assertion is correct, but the reason is incorrect. D) The assertion is incorrect, but the reason is correct. E) Both the assertion and the reason are incorrect.
What percentage more nitrogen would be saved annually by using reduced tillage rather than conventional tillage?
a. 2.7% b. 63% c. 50% d. 37%