Which of the following statements about soil profiles is true?
a. The B horizon is known as the zone of eluviation.
b. The R horizon is a zone of intense leaching.
c. The C horizon contains partially weathered parent material.
d. The A horizon is the regolith or rock layer.
c
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If stagnant air is trapped in the lung alveoli, the air sac swells and
A. The walls of the alveoli break down and are no longer able to exchange gases B. Cells die from lack of O2 C. Cells die from lack of nutrients D. Blood circulation is blocked E. All of these occur
Explain the process of density stratification as it applies to the formation of Earth. What will be an ideal response?
This cross section shows the location of 5 wells and the water table? Which well is most likely to be an artesian well?
A. well A B. well B C. well C D. well D E. well E
Centers of cultural innovation are also called cultural:
A) zones B) heartlands C) hearths D) brains