For most environmental issues, the solutions are
A) certain, and the science is certain.
B) complex, but the science is certain.
C) complex, and the science is insightful but tentative and evolving.
D) clear and certain, and the science is insightful but tentative.
C
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What is the name for slow, deep currents beneath the pycnocline?
A) Surface currents B) Convection currents C) Thermohaline currents D) Polar currents
Solar cookers could replace ________ as an affordable source of energy in rural villages in third world countries
A) natural gas B) nuclear power C) fusion power D) fire wood
Which statement about lakes is true?
A. Stratified layers of lakes are characterized by vertical mixing. B. Stratification increases levels of dissolved oxygen, especially in the bottom layer. C. Lakes are more vulnerable than streams to contamination by plant nutrients, and toxic substances. D. Lakes have more flushing than streams. E. Changing of water in lakes takes days to weeks.
Most active swimming fish use pelvic fins and pectoral fins ________
A) for swim propulsion B) primarily as stabilizers C) to hold onto prey D) to increase the surface area E) to turn, brake, and balance