How might the burning of coal have had opposing effects on climate during the 20th century?
What will be an ideal response?
Burning of coal adds CO2 to the atmosphere and hence warms the surface by increasing the greenhouse effect. However, one possible explanation for the 1940 to 1970 cooling trend is that it was caused by increased reflection of sunlight by sulfate aerosol particles. These tiny airborne particles are formed from sulfur dioxide (SO2) emitted by the burning of coal.
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In the northern hemisphere, ocean currents generally move in a circular pattern. Which of the following describes the direction of this motion in the North Atlantic and in the North Pacific?
A. clockwise in the Atlantic and counterclockwise in the Pacific B. clockwise in the Atlantic and clockwise in the Pacific C. counterclockwise in the Atlantic and counterclockwise in the Pacific D. counterclockwise in the Atlantic and clockwise in the Pacific
Which of the following symbol types will you use for displaying rates of population change by county (or equivalent area unit) in your state?
A. dot B. graduated color C. single symbol D. unique value
Discuss how hydrothermal vents are believed to form. What will be an ideal response?
Given that annual crop yields in each of the study plots were approximately 4 metric tons/ha, what is the ratio of soil lost to crop yield under conventional tillage?
a. 64,000 kg soil/1 ton crop yield b. 4,000 tons crop yield/1 kg soil c. 16,000 kg soil/4 tons crop yield d. 4,000 kg soil/1 ton crop yield