Rocks on the ocean floor are all ____
a. granite
b. geologically old
c. geologically young
d. sedimentary
c
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Why is the SOFAR layer efficient for sound travel?
a. Refraction causes the sound energy to remain within the layer. b. The density of the SOFAR layer traps the sound energy. c. Sound energy bends away from layers of lower sound velocity. d. Temperatures and salinity conditions are homogeneous. e. Sound travels rapidly in this layer.
Increasing amounts of CO2 in the atmosphere results in increased global temperatures
Indicate whether this statement is true or false.
Which of the following is the least abundant natural greenhouse gas?
A) oxygen B) carbon dioxide C) nitrogen D) methane E) water vapor
An ethical guideline to sustainable living is to ____ the way that nature sustains itself.
A. understand B. know C. feel D. support E. mimic