Low, layered clouds associated with gray, overcast skies are called:
a. cirrus.
b. stratus.
c. lenticular.
d. cumulonimbus.
B
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In general, the healthiest soil texture for plants is one in which
A) sand dominates, clays are next highest in concentration, and silt has the smallest concentration. B) clay dominates, sands are next highest in concentration, and silt has the smallest concentration. C) sand dominates, silts are next highest in concentration, and clay has the smallest concentration. D) there is a relatively even percentage of sand, silt, and clay.
Carbon dioxide:
A) comprises up to two percent of the atmospheric gases. B) is being removed from the atmosphere faster than it is being inputted. C) is removed from the atmosphere by photosynthesis. D) is not present in significant amounts in the atmosphere of Venus.
The boundary between the United States and Canada is best described by which of the following?
A) geometric only B) linguistic and religious C) water and linguistic D) mountain and water E) water and geometric
What does this texture indicate about the formation of this rock?
A. The magma had abundant dissolved gas. B. It formed from an explosive pyroclastic eruption. C. The rock solidified at great depth. D. The magma formed some crystals before rising closer to the surface and solidifying.