The effect of toxicants on fetuses and young children ________
A) is less than for adults because their metabolism is higher
B) has not raised concern among environmental health professionals
C) has been thoroughly evaluated for every chemical released into both indoor and outdoor environments
D) is generally the same for adults
E) is greater because of their developmental immaturity, rapid growth and smaller biomass
E
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Water at 4°C sinks to the bottom of a pond because
A. like a rock, it is denser than surrounding water. B. it benefits fish and other life forms there. C. of the presence of microscopic ice crystals. D. it will not freeze there.
What causes most places on Earth to have seasons?
a) Earth is closer to the Sun in the Northern Hemisphere summer and farther away in the Northern Hemisphere winter. b) The spin axis is tilted 23.5. degrees to the plane of Earth's orbit, causing solar radiation to vary in angle as Earth revolves around the Sun. c) The spin axis changes with tilt, causing winter when the tilt is great and summer when the tilt is small. d) Days are longer during summer than winter, so the extra sunshine causes it to be warmer in summer and less sunshine causes it to be colder in winter. e) There is more ice in winter, so it is colder, and less in summer, when it is warmer.
When tilted or folded sedimentary rocks are overlain by more flat-lying strata, it is known as:
a) A disconformity b) An angular unconformity c) A nonconformity d) A conformity e) None of the above
When dams are found to be unsafe, the problem is most often that they have been built with defective materials that are not strong enough to hold the projected reservoir volume.
Answer the following statement true (T) or false (F)