How many valence electrons does gallium (Ga, atomic no. = 31) have?
A. 1
B. 3
C. 70
D. 6
E. 31
Answer: B
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The youngest event represented in this block diagram is
A) formation of the lowest layer.
B) deposition of the top layer.
C) erosion of a canyon by a river.
D) retreat of the seas.
The downward movement of material along a curved surface of rupture, which is characterized by the
backward rotation of the displaced block, is called a(n) ____________________. Fill in the blank(s) with the appropriate word(s).
In cultural eutrophication, fish die from ____.
A. acid deposition B. depletion of oxygen C. toxic substances in the water D. increased sediment reducing habitats E. loss of space
Why are precipitation and cloud associated with low pressure systems, and clear conditions associated with high pressure systems?