The region of greatest tornado activity shifts northward from early spring to summer. Why does this occur?
What will be an ideal response?
Answers may vary.
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The heterosphere is the layer of the atmosphere in which the gases are ________ because of ________
A) well mixed; thermal motions (i.e., convection) B) well mixed; the influence of gravity which causes gases of different weight to diffuse randomly C) poorly mixed; thermal motions (i.e., convection) D) poorly mixed; the influence of gravity which causes gases of different weight to separate into layers
Though Khartoum and Urumqi both have dry BW climates, temperatures are much more variable for Urumqi. Why?
A. Khartoum's latitude B. Khartoum's rain shadow C. Urumqi's rain shadow D. Urumqi's latitude
The circle of illumination divides Earth into two hemispheres known as:
a. east and west. b. north and south. c. day and night. d. summer and winter.
Hydrothermal deposits are predominantly composed of what type of ore minerals?
A. oxide B. pegmatite C. evaporite D. sulfide