Deficiency of which of the following is associated with rickets?
A) vitamin A
B) vitamin B1
C) vitamin C
D) vitamin D
D
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Vertical and horizontal movement caused by the expansion of freezing water are called
A) frost heaving and frost thrusting, respectively. B) frost thrusting and frost heaving, respectively. C) frost heaving. D) frost thrusting.
Which of these regions is high because of mantle upwelling near a continental rift?
A. 1, Andes of South America B. 2, East Africa C. 3, Tibet D. None of these choices are correct.
The Superfund law was passed in 1980 to bring about cleanup of abandoned toxic waste sites.
Answer the following statement true (T) or false (F)
Which of the following occurs when frost forms?
A. Frost forms through sublimation. B. The dew point is above 0ºC. C. Objects on the ground cool above the dew-point temperature. D. Water vapour changes into ice without first becoming a liquid.