Answer: D) soil degradation
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
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
Tides are long waves that are generated by gravity and inertia
Indicate whether the statement is true or false
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