Which layer of the planet forms 80 percent of Earth's total volume, and has an average density of 4.5 grams/cm3?
A) continental crust
B) oceanic crust
C) mantle
D) core
C
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Riffles are important in
A) filtering pollutants in lentic systems. B) filtering pollutants in lotic systems. C) oxygenating the water in lentic systems. D) oxygenating the water in lotic systems.
Alluvial fans commonly occur in the marine environment. Indicate whether the statement is true or false
Which of the following is true regarding the fuel for a fission reaction?
A) Any isotope of uranium can be used. B) Only U-235 can be used. C) Only U-238 can be used. D) Uranium is not a suitable fuel.
Which has stronger attractions among its submicroscopic particles: a solid at 25°C or a gas at 25°C?
A. The attractions among the submicroscopic particles of the solid are much stronger-so much stronger that they hold the particles of the solid absolutely still. B. The temperatures of these two materials are the same, which means that the attractions among their submicroscopic particles are also of the same strength. C. The attractions among the submicroscopic particles of the solid must be stronger than the attractions among the particles of the gas. D. The submicroscopic particles of the gas are moving faster. This means that they have more energy, which means that the attractions among them must be stronger.