One of the negative environmental impacts of a recently clear cut forested area would be
A: an increase in the nitrate concentration
B: an increase in the average topsoil depth
C: decreased volume of runoff from rainfall
D: decreased water temperature in local streams
E: decrease landslide frequency
A: an increase in the nitrate concentration
B: an increase in the average topsoil depth
C: decreased volume of runoff from rainfall
D: decreased water temperature in local streams
E: decrease landslide frequency
举一反三
- According to the DLVO theory, if electrolyte (coagulant) is dosed, concentration of ions having same charge with the counter-ions would _____; the electric double layer would be compressed; zeta potential _____; stability _____; thus, colloid coagulation would occur. A: decrease; decrease; decrease B: increase; decrease; decrease C: increase; decrease; increase D: increase; increase; increase
- Should Canada impose a tariff on imports, one would expect Canada's:（ ） A: Terms of trade to improve and volume of trade to decrease B: Terms of trade to worsen and volume of trade to decrease C: Terms of trade to improve and volume of trade to increase D: Terms of trade to worsen and volume of trade to increase
- An increase in average temperature by only a few degrees could cause environmental problems ________.
- For the impacts of climate change on water resources in China, which of the following options is wrong? A: The observed runoff volume of major rivers showed an increase trend. B: The process of hydrologic cycle has accelerated. C: Changes in water resources and its spatial distribution. D: The frequency and intensity of extreme weather events has enhanced, such as rainstorm and strong storm surge.
- What changes have taken place in food compared with 20 years ago?（） A: Volume increase B: Volume decrease C: Calories increase D: Calories decrease