In the vertical, the pressure gradient force points ____ and gravity points ____
A) toward Earth; away from Earth
B) toward Earth; toward Earth
C) away from Earth; away from Earth
D) away from Earth; toward Earth
D
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________ pollutants are chemicals or particles that are directly emitted from identifiable sources
A) Primary B) Secondary C) Tertiary D) Man-made E) Natural
According to the U.N. Environment Programme how many species have gone extinct in the past century?
A. Almost 100 B. Nearly 1,700 C. Over 250 D. More than 800 E. 563
The name of the current that flows from north to south along the west coast of North America is the California current
Indicate whether the statement is true or false
________ is a modification of shifting cultivation where crops are rotated around a village, fallow periods are shorter and soil may be enriched through household waste
A) Bush fallow B) Slash and burn C) Pastoralism D) Sedentary farming E) none of the above