The subdivision of the geologic time scale that represents the longest time span is called a(n) _________

a. epoch
b. era
c. period
d. stage


Answer: b. era

Environmental & Atmospheric Sciences

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Less water is available for evaporation in cities. Why is this so?

What will be an ideal response?

Environmental & Atmospheric Sciences

From the following statements and questions, which is the best example of deductive reasoning?

A. In repeated tosses of a coin, there is a 50/50 chance of each toss resulting in a "head" B. If all insects have six legs, then butterflies have six legs C. How many times will the toss of coins turn "heads-up" if 100 times toss a coin? D. Since every insect I have examined so far has six legs, I conclude that all insects must have six legs E. All of these are examples of deductive reasoning

Environmental & Atmospheric Sciences

Most of the recent global warming is due to an enhanced greenhouse effect caused by increasing levels of greenhouse gases, such as CO2

a. True b. False

Environmental & Atmospheric Sciences

Approximately ________% of the world's marine fish populations are either fully exploited or overexploited

A) 20 B) 40 C) 50 D) 60 E) 80

Environmental & Atmospheric Sciences