Since the turn of this century, CO2 in the atmosphere has:a
been increasing in concentration.
b. been decreasing in concentration.
c. remained at about the same concentration from year to year.
d. disappeared entirely.
a
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Which of the following best matches the description?Series of layers seen as one digs down into soil.
A. loam B. windbreak C. lithosphere D. soil structure E. soil profile F. mechanical weathering G. weathering H. friable I. chemical weathering J. soil texture K. humus L. contour farming M. terrace N. leaching O. parent material P. asthenosphere Q. horizon
Magmas in the magma chamber of a volcano are often compared to soda to explain how the magma is erupted. How is magma like a bottle of soda? What happens to both substances when the pressure changes?
What will be an ideal response?
The primary advantage of hydropower is that it ________
A) is the most economically feasible of all the renewable energy resources B) is the oldest of the renewable energy resources C) is widely available to all countries D) does not rely on fossil fuel to generate electricity E) produces no environmental effects
The gases that make up 99% of Earth's atmosphere are
A) nitrogen and carbon dioxide. B) oxygen and carbon dioxide. C) oxygen and nitrogen. D) oxygen and hydrogen.