What are reserves?
A) quantities that are known and available for exploitation with current technologies at current prices
B) substances that are known to exist, but are held back to save them for the future
C) estimates of the quantities likely to be discovered with greater exploration
D) all substances that may someday be used
E) resources that have been mined, but are currently in storage and will be utilized when prices rise
D
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A subsidence inversion
A) increases pollutant concentration aloft and decreases pollutant concentration near the surface. B) decreases pollutant concentration aloft and increases pollutant concentration near the surface. C) increases pollutant concentration both aloft and near the surface. D) decreases pollutant concentration both aloft and near the surface.
In 1992, the Canadian government ________
A) banned the use of trawl fishing B) started harvesting manganese nodules from the ocean floor C) ordered a complete ban on cod fishing D) enacted laws to protect many species of whales E) gave subsidies to fishermen who were losing money due to low fish harvests
A stream tributary may erode headward to capture another stream system because:
a. it has a steep gradient b. its channel is cut into nonresistant material c. it has a concave longitudinal profile d. both a and b
A climograph is a mechanical instrument used for measuring climates
Indicate whether the statement is true or false