Fjords are long, steep-walled embayments. They were formerly glacial valleys, and now drowned by the sea.
a. true
b. false
Answer: a. true
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When wolves in the Yellowstone area in Wyoming were eliminated, the population of elk exploded and overgrazed the population of coyote willow shrubs that dominated the riverside ecosystems. Which type of species interaction was disrupted by the removal of the wolves?
A. predator-prey B. parasitism C. interspecific competition D. resource partitioning
Which of the following statements is true?
A) Environmental policy debates are almost always politically divisive. B) Deregulation efforts typically lead to more effective policy. C) National elections rarely influence environmental policy. D) Environmental policy springs mostly from science and not election results.
Which of the following are most commonly recycled from MSW, at the highest percentages?
A) Plastic food bags and glass B) Aluminum and glass C) Plastic, textiles, and old tires D) Yard wastes, paper, and paperboard
Some minerals are economical to mine at lower concentrations because of their higher value to society and relatively low extraction costs.
Answer the following statement true (T) or false (F)