Human Events and the Environment Answers

Tillage can release pollutants in the soil and

Which of the following statements about pesticides and herbicides is not true?a.They can enter waterways, polluting them.b.Once the pesticides and herbicides break down, they are no longer harmful.c.Pesticides and herbicides are widely used in agriculture.d.Pesticides and herbicides can have negative effects on the environment.

How is the environment affected by a large-scale oil spill?a.Large-scale oil spills are the largest contributor to air pollution.b.Large-scale oil spills lead directly to wetlands becoming deserts.c.Large-scale oil spills are damaging to water quality, aquatic life, and bird populations.d.Large-scale oil spills can lead to an increase in sea levels through glacial melting.

What sometimes occurs when reclaimed water is used in agriculture?a.crop deathb.overtillagec.pharmaceutical accumulationd.increased land use

How can fertilizer use be detrimental to the environment?a.It can enter waterways, causing them to accumulate an excess of nutrients.b.High levels of fertilizer in bodies of water can lead to excess algal growth.c.Fertilizer can lead to oxygen depletion, and be harmful to organisms in waterways.d.All of the above

Large-scale fires can lead to a decrease in atmospheric carbon dioxide.

Dead zones in waterways can occur as the result of fertilizer runoff.

Which of the following factors can lead to desertification in the presence of natural drought?a.deforestationb.sustainable grazingc.underground miningd.all of the above

Which of the following is a consequence of sedimentation to wetlands?a.increased biodiversityb.water quality improvementc.habitat lossd.decreased turbidity

Sedimentation increases with an increase in land used for agriculture.