Magma tends to rise toward Earth's surface principally because ________
A) water is an abundant constituent of magma
B) silica increases the viscosity of the magma
C) rocks become less dense when they melt
D) of convection in the mantle
Answer: C) rocks become less dense when they melt
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What is the only substance to have a higher heat capacity than liquid water?
A) Acetone B) Gasoline C) Ammonia D) Ice
Which of the following is the definition of pH?
A) 1 x 10^pH B) log[H3O+] C) -log[H3O+] D) none of these
The southeastern United States lies in the heart of the "horse latitudes" where normally we would expect desert conditions. Why isn't this area a desert?
A) Continental polar air masses disturb the pattern by periodic influxes of cold air. B) Maritime polar air masses disturb the pattern by driving pacific moisture across North America. C) Maritime tropical air masses derived from the Gulf of Mexico disturb the pattern when these air masses are drawn northward by cyclonic storms. D) Continental tropical air masses derived from Mexico disturb the pattern when these air masses are drawn northward by cyclonic storms.
Judge the following sentence according to the criteria given below: The concentration of marine life increases as the distance from the continental margins into the open sea increases BECAUSE the continents are the major sources of the nutrients
phytoplankton needed for the process of photosynthesis. 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.