Primary productivity in nontropical terrestrial environments is typically limited by what nutrient?
A) K B) N C) Fe D) P
B
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Before the 1960s, how did geologists view the ocean basins and continents of the Earth?
a. Scientists believed that continents and ocean basins changed shape and location over time through the repeated erosion and deposition of sediments. b. Scientists believed that all ocean basins and landmasses were permanently fixed in their positions. c. Scientists believed that the formation of mountain chains and new ocean basins caused the movement of continents and oceanic sea floor. d. Scientists believed that continents moved over time as a result of convection in the mantle. e. Scientists believed that continents moved over time by plowing through oceanic crust.
A lack of sunspots has been used as an explanation for ________
A) the Ice Age B) Little Ice Age C) a lack of aerosols in Earth's atmosphere D) changes in the Earth's orbit E) global warming
What sort of energy is attributed to objects in motion?
A. Chemical energy B. Kinetic energy C. Magnetic energy D. Potential energy
In the demographic transition model, the highest growth rate in a country is likely to occur during ________
A) stage 1, the pretransition stage B) stage 2, the mortality transitional stage C) stage 3, the fertility transition stage D) stage 4, the postindustrial or modern stage E) stage 5, the stability transition stage