Which method below describes how scientists have tried to modify hurricanes?
a. putting an oil slick over the ocean water and igniting it
b. seeding the hurricanes with silver iodide
c. igniting huge smoke bombs in the eye of the storm
d. seeding the hurricanes with hair-thin pieces of aluminum called chaff
e. cooling the ocean temperatures
ANSWER: b
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a. hose b. hydrant c. spanner d. lug
Why didn't ice gather in central and northern Alaska in the last ice age?
A) Proximity to the sea kept it too warm. B) The climate at that time was tropical. C) There was too little precipitation. D) There was too much geothermal heating from volcanic action.
A coarse-grained weakly foliated metamorphic rock composed of plagioclase feldspar and hornblende (an amphibole) is classified as a(n)
A) marble. B) greenstone. C) amphibolite. D) hornfels.
________ will occur when continental collisions occur, thickening the crust and forcing some rocks to a depth where melting can take place
A) Decompression melting B) Rifting C) Extension D) Partial melting