The most important mechanism by which the Earth system receives its energy is ____
a. radiation
b. conduction
c. convection
d. advection
a
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A clerk can lift containers a vertical distance of 1 m or can roll them up a 2-m-long ramp to the same elevation. With the ramp, the applied force required is about
A) half as much. B) twice as much. C) the same.
The potential for increasing the use of biomass for fuel is limited because
A) it already serves an essential purpose other than energy, including providing food and shelter. B) subsidies are not offered to grow biofuels. C) technology cannot accommodate GMO strains of the crop. D) the Big Three Auto Companies have embraced fuel efficient, small vehicles so the need has declined. E) foreign manufactured cars are not equipped to handle ethanol fuels.
Which of the following soil horizon designations is i the correct sequence from the surface to the bedrock?
A) O, E, C, B, A B) A, B, C, O, R C) S, O, I, L D) O, A, E, B, C
By putting events in order, scientists can use the order to determine how long ago certain geologic events took place
Indicate whether this statement is true or false.