Compared to the temperature today, the past Earth's atmosphere was:
a. significantly warmer
b. slightly colder
c. almost the same
d. significantly colder
Ans: a. significantly warmer
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In some instances electromagnetic radiation behaves like a wave. In other instances electromagnetic radiation behaves more like a particle. Which behavior more accurately describes the true nature of electromagnetic radiation?
A) Particle behavior more accurately describes the true nature of electromagnetic radiation. B) Electromagnetic radiation behaves both as a wave or as a particle depending on the circumstance. C) Wave behavior more accurately describes the true nature of electromagnetic radiation. D) There is no circumstance in which electromagnetic radiation can be described as either portraying particle or wave behavior.
Windblown African dust is a nuisance, but is not a health problem. Indicate whether the statement is true or false
Deserts may be classified into categories based on climate belts and an additional category based on
human misuse. Indicate whether the statement is true or false.
What color change is associated with the original breath alcohol test?
A) green to reddish orange B) reddish orange to green C) colorless to pink D) None, the test is not based on a color change.