Why has water quality degraded in the Edwards aquifer?
A) The aquifer is recharged by rivers flowing into karst limestones.
B) The city of San Antonio lies in the recharge zone.
C) Pollution has entered the aquifer via springs in the San Marcos area.
D) The aquifer is confined in its southern part, and is easily contaminated in that area.
A
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Which of the following conditions can cause damage to structures inflicted by tornadoes?
A. the increase in air pressure above a roof as high winds blow over it B. the increase in air pressure as a tornado moves overhead C. flying debris D. the tornado's weak winds
Find the stationary front located in northwestern Canada. The likely air mass to the west of the stationary front is a ________ airmass that is likely to be ________ than the air mass to the east.
A) mT; warmer
B) mP; warmer
C) cP; cooler
D) cP; warmer
In Australia, the summer solstice occurs a few days before Christmas (December 25)
Indicate whether the statement is true or false
When a country's terms of trade are good, it usually exports relatively high-value commodities and imports relatively low-value ones
Indicate whether the statement is true or false