Cloud iridescence is caused mainly by ____
A) refraction
B) reflection
C) diffraction
D) dispersion
C
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In the United States, large areas of ________ are blanketed with a cover of loess.
A. the Rocky Mountains B. the Midwest C. Arizona and New Mexico D. Canada E. California
What percentage of synthetic chemicals commonly used today has been adequately tested to determine if they are mutagen, carcinogen, or teratogen?
a. almost 90% b. 75% c. 50% d. 25% e. 2%
Tectonic plates are pieces of the ________ that float on the more fluid ________ below.
a) asthenosphere; lithosphere b) lithosphere; asthenosphere c) lithosphere; mesosphere d) mantle; crust e) crust; lithosphere
The volcano called ________ is the youngest of the Hawaiian volcanoes
Fill in the blank(s) with correct word