Each of the three major cultural revolutions has allowed ____.
A. ecological restoration
B. expansion of the human population
C. greater worldwide sustainability
D. pollution prevention
E. decreased consumption
Answer: B
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The threat of famine is most persistent in which region of the globe?
A) Southeast Asia B) South Asia C) Horn of Africa and the Sahel D) Congo River Basin E) Central America
Where are the oldest rocks on the Atlantic seafloor located?
A. mid-ocean ridges B. trenches C. along coastlines
As magma approaches the surface, water contributes to the explosive potential of the eruption because ________
A) water dissociates to hydrogen and oxygen at high temperatures but reacts violently at decreasing pressures to produce explosive eruptions B) water has a lower density in its solid phase than its liquid phase which makes it explode when pressure decreases C) water has a large heat capacity, which allow it to keep the magma hot enough to explode D) water dissolved in magma flashes to steam as pressure decreases, and the volume increase leads to an explosive potential
The surface tension of pure water will increase ________.
A. if the temperature decreases B. when salt is added and if the temperature decreases C. if pressure is increased D. when salt is added E. All of these choices are correct.