A severe reduction in wetlands in the San Joaquin Valley of California played a significant role in the
severity of the 1977 duststorm. What caused the reduction of wetlands? What will be an ideal response?
Beaver trapper Jedidiah Smith in the early 1800’s described millions of acres of wetlands in parts of
the San Joaquin Valley, California. Today only about 5% of the wetlands reported by Smith remain.
Agriculture, urban development and oilfields have replaced the wetlands.
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Which of the following are differences between an eruption column and pyroclastic flow?
A) Tephra in an eruption column stays hotter until it reaches the ground. B) A pyroclastic flow rises higher into the atmosphere than an eruption column. C) Damage from an eruption column is more restricted than a pyroclastic flow. D) A pyroclastic flow forms when the gas flux cannot support the column.
What moves carbon back and forth between the biosphere and atmosphere?
A) evapotranspiration and photosynthesis B) photosynthesis and respiration C) respiration and evapotranspiration D) evapotranspiration
Eutrophication is caused by ____
A) rising ocean temperatures B) the increase of atmospheric carbon dioxide C) the release of excess nutrients D) overfishing
About 80% of the ocean's water exists in the ________
A) pycnocline B) thermocline C) surface zone D) deep zone E) euphotic zone