The sky will begin to turn milky white ____
a. when the concentration of ozone begins to reach dangerous levels
b. when small particles such as dust and salt become suspended in the air
c. when the relative humidity decreases below about ten percent
d. on an oppressively hot day of the year
e. when an inferior mirage occurs
ANSWER: b
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A(n) ____________ is a substance composed of identical particles called ______________ that cannot be broken into
simpler substances by chemical means. Fill in the blank(s) with the appropriate word(s).
The difference in time it took for Columbus to cross the Atlantic and John Glenn to cross the Atlantic is an example of
A) better time measurement. B) better geographic knowledge. C) space-time compression. D) establishing longitude as part of the grid. E) establishing a prime meridian.
Use the Venn diagram below for this question.
Which feature(s) are present at plate boundaries?
A. Stratovolcano B. Shield volcano C. Cinder Cone D. All of the choices are correct.
Which type(s) of magma result in erupted material that is mostly in the form of ash?
a. ?rhyolite only b. ?andesite only c. ?basalt only d. ?both andesite and basalt e. ?both basalt and rhyolite