________ and nickel are thought to comprise significant portions of the Earth's inner and outer cores
A) Aluminum
B) Quartz
C) Basalt
D) Iron
E) Titanium
Answer: D
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All of the following statements about the sulfur cycle are true except for the following:
A) Sulfur is released into the atmosphere when humans burn coal. B) Unlike nitrogen and carbon, organisms do not require or contain sulfur. C) Most sulfur is found in rocks and minerals. D) A natural source of sulfur in soils is the weathering of rocks.
?If tonight's temperature is going to drop into the middle 20s (°F) and a fairly stiff wind is predicted, probably the best way to protect an orchard against a hard freeze is to (assume that cost is not a factor)
a. ?use helicopters. b. ?use wind machines. c. ?sprinkle the crops with water. d. ?put orchard heaters to work. e. ?pray for clouds.
Floods can occur in winter.
Answer the following statement true (T) or false (F)
Which of the following statements is NOT true?
a. Cyclonic flow is associated with low pressure. b. Surface winds flow parallel to the isobars. c. Flow around a high-pressure area in the Southern Hemisphere is counterclockwise. d. Flow around a low-pressure area in the Northern Hemisphere is counterclockwise.