Since 1945, approximately ____ species of insects and rodents have developed resistance to one or more insecticides
a. 50
b. 500
c. 1,000
d. 2,000
e. 5,000
C
Environmental & Atmospheric Sciences
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Nuclear power supplies about ________ of all electricity in the United States
A) three-fourths B) two-thirds C) one-half D) one-tenth E) one-fifth
Environmental & Atmospheric Sciences
When did the Himalayan Mountains form?
A) Cenozoic Era B) Paleozoic Era C) Mesozoic Era D) Devonian Period
Environmental & Atmospheric Sciences
The world record for the longest period without rainfall occurred in a
A) polar desert. B) sub-tropical desert. C) rain-shadow desert. D) coastal desert.
Environmental & Atmospheric Sciences
The circle of illumination divides Earth into two hemispheres known as:
a. east and west. b. north and south. c. day and night. d. summer and winter.
Environmental & Atmospheric Sciences