Clearly explain the relationship between irrigation and salinization of soils
What will be an ideal response
Water used in irrigation contains small concentrations of dissolved salts. As evaporation and transpiration occur, the water molecules leave, but the salt is left behind. Over long periods of irrigation and evapotranspiration, the end result is an increasing concentration of salts in the soil. This results in salinization of the soil.
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How do keystone species differ from indicator species?
What will be an ideal response?
What is not a factor in the amount of light penetrating the ocean?
A) The angle at which the light approaches the Earth B) The surface turbulence of the ocean C) The amount of light absorbed by clouds D) The presence of ice or foam on the surface
The polar front occurs in which of the following regions?
A) 30 degrees B) 30 to 60 degrees C) 60 degrees D) 60 to 90 degrees E) Poles (90 degrees)
Which of the following statements is not true?
A. By the time studies of rain acidity were begun, all air was polluted to some extent. B. The problems caused by acid rain vary in severity with local soil and bedrock geology. C. Rainfall is often more acidic downwind of coal-fired power plants. D. Rainfall would not be acidic if burning of sulfur-rich coal were stopped.