We lose 5 to 7 million hectares of productive cropland per year to ________

A) abandonment, feralization, and other factors
B) forest replanting and regeneration
C) recreational land use
D) soil degradation
E) soil conservation efforts


Answer: D) soil degradation

Environmental & Atmospheric Sciences

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What can one deduce (figure out) about a region by analyzing stream patterns in an aerial photograph or a map?

A. The discharge of a stream B. The age of the stream C. The geology beneath a stream

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Phytoremediation

a. involves the use of plants to remove contaminants from polluted soil and water b. involves the use of microscopic filter-feeding organisms to filter contaminants from water c. has been shown to be ineffective in the long term d. is too costly to be practical e. all of these answers

Environmental & Atmospheric Sciences

Which of the following sources of radiation provides most of our yearly exposure?

A. dental and medical X-rays B. televisions (cathode ray tubes) C. living near nuclear power plants D. smoke detectors E. background radiation

Environmental & Atmospheric Sciences

Tides are long waves that are generated by gravity and inertia

Indicate whether the statement is true or false

Environmental & Atmospheric Sciences