During the Cold War, the line between Communist and non-Communist countries of Europe was called

A. the Iron Curtain
B. the Wall
C. the Barbed-wire Fence
D. the Demilitarized Zone


A. the Iron Curtain

Environmental & Atmospheric Sciences

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By digesting soil, earthworms:

a. change the structure of the soil. b. change the texture of the soil. c. change the chemical quality of the soil. d. all of these

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Eighty calories of heat energy must be removed per gram of pure water at 0°C to form ice. This represents water's ____

A) latent heat of evaporation B) latent heat of fusion C) sensible heat D) temperature

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Which currents are the slow, deep currents that affect seawater beneath the pycnocline?

a. deep-ocean b. thermocline c. surface d. thermohaline e. turbidity

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