Finding several species of fossils, rather than just one, in the same rock layer is more useful to geologists because:
a) if the conditions were not right for fossilization for one species, maybe the conditions were better for other fossil species
b) if some of the fossils are broken, others could be used as index species
c) it indicates the sediments must have been deposited at the same time when all the species were present
Answer: c) it indicates the sediments must have been deposited at the same time when all the species were present
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The periods between glaciations are separated by warmer ____ stages
a. endothermic b. intercyclic c. interglacial d. thermostatic e. intermontaine
Which soil horizon is known as the zone of leaching?
a. A b. B c. C d. D e. O
When volcanoes erupt, they emit ________ into the atmosphere, resulting in a cooling effect on the planet
A) nitrous oxide B) water vapor C) sulfate aerosols D) methane
According to the precautionary principle, when there is substantial preliminary evidence that an activity, technology, or chemical substance can harm humans, other organisms, or the environment, decision makers should take measures to prevent or reduce such harm, rather than waiting for more conclusive scientific evidence.?
Answer the following statement true (T) or false (F)