What fundamental concept states that in a horizontal sequence of conformable sedimentary strata, each higher bed is younger than the bed below it?
A) theory of superstition B) theory of correlative deposition
C) law of superposition D) law of original correlation
C
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How come an animal's carbon-14 levels do not start to decrease until it dies?
A. because it constantly replenishes its carbon-14 supply by eating plants with carbon-14 in them B. because it constantly replenishes its carbon-14 supply by breathing air with carbon-14 in it C. carbon-14 only starts to decay after the animal dies D. The carbon-14 levels do not decrease because the carbon-13 in its skin protects it from cosmic rays. E. because it is constantly being bombarded with cosmic rays
Should scientists be encouraged to make short term earthquake predictions even though the current methods for such predictions are very unreliable?
What will be an ideal response?
Teratogens are often also ________
A) carcinogens B) neurotoxins C) asphyxiants D) endocrine disrupters E) allergens
Which of the following statements regarding carbon dioxide (CO2) and the greenhouse effect is true?
A. all of the answers listed here. B. CO2 concentration in the atmosphere is relatively low. C. without CO2, the average global temperature would be below freezing. D. link between CO2 and the greenhouse effect was proven in the 1800s. E. global warming from burning fossil fuels was predicted in the 1800s.