The major end product of chemical weathering is(are) _______.
a - clays
b - sands
c - silts
d - talus
e - airborne dust
a - clays
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In what way can human practices contribute to desertification?
A) overgrazing by livestock B) growth of too much crop cover C) growth of trees D) irrigation with rainwater
If all of the stratospheric ozone suddenly disappeared, ________
A) plants would flourish B) insects would be the only organisms to survive C) Earth's surface would warm considerably D) there would be a dramatic decrease in skin cancers E) most life on Earth would cease to exist because of the amount of UV radiation penetrating the atmosphere
Outdoor air pollution is reduced when ____.
A. buildings slow wind speed and reduce dilution of pollutants B. hills and mountains reduce the flow of air in valleys C. high temperatures promote formation of photochemical smog D. chemical reactions produce acidic precipitation which falls out of the atmosphere E. temperature inversions form over cities surrounded by mountains
What is the importance of cyanobacteria for our atmosphere? What did they produce and how? What happened to the first materials they produced?
What will be an ideal response?