Which of the following is NOT needed for plant growth?
a. water
b. air
c. humus
d. mineral matter
e. All of these are needed.
E
Environmental & Atmospheric Sciences
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A dropped boulder gains speed due to
A. inertia. B. velocity changes. C. gravity. D. its nature to become closer to Earth.
Environmental & Atmospheric Sciences
What is the average number of traffic deaths each year in the U.S.?
a) Under 4,000 b) About 10,000 c) About 30,000 d) Well over 100,000
Environmental & Atmospheric Sciences
The biomass of planktonic, unicellular algae in tropical regions ________.
A. increases during the summer months B. decreases during the summer months C. decreases during the winter months D. increases during the winter months E. remains nearly constant over the year
Environmental & Atmospheric Sciences
Island arcs are associated with
A. ocean-ocean convergences. B. ocean-continent convergences. C. hot spots. D. continent-continent collisions.
Environmental & Atmospheric Sciences