Which of the following best describes a floodplain?
A) an area that is incidentally flooded when farming or mining operations change the course of rivers
B) an area that is periodically flooded because humans have altered the landscape
C) a region of land that is periodically flooded when a river overflows
D) a region of land that has been deliberately, permanently flooded due to human disturbance, such as in dam building
E) an area where flood irrigation of crops is used, such as a rice paddy
C
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One of the greatest success stories of the positive impact of chemistry research and environmental policies and regulations relates to
A) nitrogen oxides and the control of acid precipitation. B) CFCs and the destruction of the ozone. C) the reduction of ozone pollution over major cities in North America. D) the use of fossil fuels and the reversal of global climate changes.
Which of the following is the most abundant negatively charged component of seawater?
A) Calcium B) Chloride C) Magnesium D) Sodium E) Sulfate
Which statement is true of sediments in the ocean?
a. Biogenous sediments comprise a larger area than terrigenous sediments. b. Terrigenous sediments comprise a larger area than biogenous sediments. c. Hydrogenous sediments cover more volume than biogenous sediments. d. Cosmogenous sediments cover more volume than biogenous sediments. e. Terrigenous and biogenous sediments are equal in area and volume.
The largest mass extinction took place some 250 million years ago and wiped about 65% of the world's existing species.
Answer the following statement true (T) or false (F)