Using the most reliable information available, how much of the Earth's land surface is used for agriculture today?
What will be an ideal response?
Answer: 30 to 40%, according to satellite imagery
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A stream begins at an elevation of 200 meters and flows a distance of 400 kilometers to the ocean. What is the average gradient?
A) 0.5 km/in B) 2 km/m C) 2 m/km D) 0.5 m/km
An electrical device that is "grounded" has
A. no potential difference between it and the ground. B. an infinite potential difference between it and the ground. C. low voltage. D. a firm connection to the ground.
Forced convection:
A) is a form of laminar flow. B) results from vertical temperature differentials. C) occurs when a fluid breaks into eddies. D) is a major cause of upper-level aircraft turbulence.
Explain how the open sea can be both an area of low average primary productivity and the largest contributor to the earth's overall net primary productivity.
What will be an ideal response?