Ten thousand years ago, forests covered approximately 50% of Earth. Today, forests cover approximately ________ of the Earth's land area
A) 50% B) 15% C) 5% D) 30% E) 70%
D
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A machine increases the potential energy of a heavy load by about 1000 J with a work input of 2000 J. The efficiency of the machine is about
A. 50%. B. 80%. C. 20%. D. 10%.
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.
Which element would be surprisingly considered a trace element in the ocean despite its abundance in the
atmosphere? a. sodium b. nitrogen c. calcium d. chloride e. oxygen
The low latitude dry regions coincide with ________
A) the polar high pressure belt B) the subtropical low pressure belts C) the gulf stream D) the polar low pressure belt E) the subtropical high pressure belts