Why will we never be able to replace the gasoline we currently use to power our vehicles in the U.S. by either ethanol made from corn or cellulosic ethanol?
What will be an ideal response?
The main problem will be the amount of landed needed to grow the vast number of crops necessary to produce enough alcohol to replace the huge amount of gasoline our vehicles consume. We would need to grow corn in an area seven times larger than we are presently farming just to replace half of the gasoline we use with cellulosic ethanol. It is more efficient to make cellulosic ethanol than corn-based ethanol. In addition, an affordable way to produce cellulosic ethanol has yet to be developed and the challenges are considerable.
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During the process of excretion, ________ moves from capillaries into ________.
A. the filtrate; Bowman's capsule B. the filtrate; the proximal tubule C. blood; the distal tubule D. blood; the loop of Henle
Which of the following is a principle to interpret relative ages?
a) The youngest rock is on the bottom b) a geologic feature is older than any rock or feature it crosscuts c) a younger rock can include pieces of an older rock d) an older magma can bake or metamorphose younger rocks
This type of front moves very slowly, if at all: ________ front
Fill in the blank(s) with the appropriate word(s).
Cinder cones are formed when ____
a. ?seawater leaches into the magma plume of a stratovolcano b. ?low-viscosity basalt encounters groundwater near the surface c. ?a magma chamber collapses, building magma pressure d. ?a volcanic eruption creates large amounts of ash e. ?high-viscosity rhyolite interacts with surface soil