This is the Three Gorges Dam, a hydroelectric gravity dam that spans the Yangtze River in China. Which of these is a function of dams in the water control system?
A)
Dams are used for controlling floods.
B)
Dams are used for generating hydroelectric power.
Dams increase the annual runoff available for human use.
D
Dams are used to supply irrigation and water for towns and cities.

In which reaction is precipitation occurring?

Which property of a rock remains unchanged by mechanical weathering? a. total surface area b. size and shape c. mineral composition d. sharpness

)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.