What is the usual cause of soil salinization?
A. Overdevelopment of residential areas
B. Heavy irrigation on poorly drained desert soils
C. Excessive soil erosion
D. Excessive fertilizer additions
Answer: B
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In 1800, the core of the world-system was located in
A) North America. B) Japan. C) western Europe. D) the countries surrounding the Mediterranean. E) China.
The figure below represents the scattering of sunlight by an air molecule. The group of rays labelled B is scattered light. Which of the following groups of rays is the most intense beam of light?
A. group A B. group B C. group C
According to Leslie White, what kind of energy does society harness in Stage 2 of human development
A. Human muscle power B. Surplus food production C. Natural resources like coal D. Domesticated animals
Which statement about geostrophic gyres is true?
A) One of the six gyres is the Antarctic Circumpolar Current. B) Gyres are influenced by the Coriolis effect and the position of continental landmasses. C) Gyres are formed by deep water currents that flow in a continuous circuit around the five major basins. D) Sea level is lower in the middle of the gyre.