Q14 - Major threats to marine biodiversity are: A: Tourism, overfishing and climate change B: Overfishing, climate change, and land-based runoff C: Mining, land-based runoff and overfishing

The term "grey water" is used to describe A: runoff from agricultural fields B: wastewater containing human waste C: effluent water from households or business activities D: rainwater that is collected and used in households E: potable water used for household activities

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

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.

Which of the following best describes the formation of “desert pavement”? A: alluvial fans are eroded to form inselbergs with flat, angular rocky surfaces B: runoff and deflation carry off the fine particles of silt and clay, leaving coarser particles behind C: groundwater in an alluvial fan evaporates, leaving behind a surface layer of hard-baked mud and boulders D: deflation removes the coarse fragments leaving behind a layer of fine sediment (loess and mud)

The diagram shows fish kills that have been linked to toxic algal blooms. Based on the lettered fish kills, which of the following is FALSE regarding toxic algal blooms? A: Toxic algal blooms are problematic becasue they often contaminate the drinking water supplies of large cities nearby (location B). B: Toxic algal blooms are found near river deltas that contain agricultural runoff emptying into the sea (location B) C: Toxic algal blooms release toxins that can accumulate in the shellfish and have killed southern sea otters near D: Toxic algal blooms tend to have negative economic impacts on fisheries at B and E: When toxic algae die, the oxygen demand increases due to decomposition. This leads to loss of dissolved oxygen in the coastal areas like