E-85 ________
A) was an international summit of 85 nations that met to restrict CFC use
B) is an ethanol-gasoline mixture used in flexible-fuel vehicles
C) was an international summit of 85 nations that met to restrict greenhouse gas emissions
D) was an international summit of 85 nations that met to determine vehicle fuel efficiency standards
E) is an isotope of uranium used to generate electricity
B
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In hundreds of years, we have released large quantities of fossil fuels that took millions of years to form.
Answer the following statement true (T) or false (F)
Approximately how much of the air we breathe is composed of nitrogen and oxygen?
A. 99% B. 66% C. 50% D. 33% E. 10%
The shape of a water table is determined by the topography of the surface of the land above it. The high part of a water table separating parts sloping in opposite directions is called the
A. hydraulic gradient. B. aquifer. C. groundwater divide.