Discuss ways to control invasive species
What will be an ideal response?
Controlling and eradicating invasive species are difficult and expensive. A wide variety of techniques has been tried, among them manual removal, introduction of predators (biocontrol), and application of toxic chemicals, heat, sound, electric current, and ultraviolet light. Most of these techniques are localized and short-lived solutions that are not very effective. Prevention of their spread through education, legislation, and such preventative actions as replacing ballast waters at sea and checking shipping containers might prove more effective in the future.
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According to the 1872 General Mining Law, miners can stake claim anywhere on public land, but must pay __________ per acre to take the minerals they find.
A. less than US $5.00 B. US $50.00 C. US $500.00 D. US $5000.00 E. None of these, miners do not have to pay anything, they just have to lay claim to the land.
Plant productivity is greatest in natural ecosystems when ________
A) the ecosystems are converted into cropland B) an invasive plant grows unchecked C) endemic species are present D) more species are present
Earlier we discussed the concept of isostasy, where lower density rocks rise higher than higher density rocks. How is the variation of water depth at spreading centers (ridges) controlled by isostasy?
A) The lithosphere cools as it moves away from the ridge axis by sea floor spreading, and cooler rocks are lower density, so the sea floor gets deeper as the lithosphere gets more dense. B) Volcanic rocks are lighter than other rocks, and so the abundant volcanic rocks at the ridges are lower density features that produce the seafloor topography. C) It has nothing to do with isostasy; the areas are simply high because there are chains of active volcanos along the ridge crest, producing the topography. D) Oceanic ridges are sites where the lithosphere is carried into the mantle on one side (aka subduction zones), and the volcanos along these margins produce the ridge by buildup of lower density crust.
Explain the difference between a territorial sea and the Exclusive Economic Zone (EEZ)
What will be an ideal response?