What is the gradient of a stream that drops 10 vertical feet over a 2-mile horizontal distance?
A. 20 feet per mile
B. 10 feet per mile
C. 2 feet per mile
D. 5 feet per mile
Answer: D
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Which of the following would be considered a physical property?
A. density B. reactivity toward acid C. oxygen sensitivity D. flammability E. corrosion resistance
The major source(s) of chlorofluorocarbons (CFCs) in the atmosphere was/were ________
A) microbial fermentation of organic matter in coal mines, oil wells, and livestock B) combustion of fossil fuels C) refrigerants, solvents, and spray propellants D) burning of fossil fuels and coal E) emissions from automobile exhaust and chemical fertilizers
Oceanic lithosphere subducts (sinks into the asthenosphere) because ________
A) the upwelling magma at divergent boundaries pushes the lithospheric plate into the asthenosphere B) the pressure from two plates colliding forces one plate into the asthenosphere C) The convection of the mantle pulls the lithosphere into the asthenosphere D) old oceanic lithosphere is more dense that the asthenosphere
Water's temperature at the bottom of Lake Tahoe, high in the Sierra Mountains in California, at this moment is
A. 4°C. B. below 4°C. C. above 4°C. D. uncertain.