Sound and light waves bend because they travel at different speeds in different media. Indicate whether the statement is true or false
ANS: T
The bending of light and sound waves is called refraction. When a light wave or a sound wave leaves a
medium of one density?such as air?and enters a medium of a different density?such as water?at
an angle other than 90?, it is bent from its original path. Information can be found in the section
Refraction Can Bend the Paths of Light and Sound through Water.
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With immediate and sustained action to stop production of all ozone-depleting chemicals:
a. The ozone-hole problem will be solved immediately. b. It will take about 5 years for the earth's ozone layer to recover to 1980 levels. c. It will take about 30 years for the earth's ozone layer to recover to pre-1950 levels. d. It will take about 60 years for the earth's ozone layer to recover to pre-1950 levels. e. It will take about 60 years for the earth's ozone layer to recover to 1980 levels.
The longest days of the year in the Southern Hemisphere are experienced at the Northern Hemisphere's
A) autumn equinox. B) spring equinox. C) winter solstice. D) summer solstice.
Rhyolite is the fine-grained equivalent of this igneous rock
A) granite B) basalt C) diorite D) andesite
What causes liquefaction to take place?
A. Surface rupture on a fault B. Fires ignited by downed power lines C. Ground shaking D. Tsunamis