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What is the driving mechanism for plate tectonics?

A)heat deep within Earth B)tidal forces caused by the moon C)volcanoes and earthquakes at plate boundaries D)gravity and magnetism acting on continents E)strong ocean currents and global winds

If current energy consumption trends continue and the per capita income of the world increased dramatically, we would expect that

A) global climate change will be a greater problem. B) literacy levels will decrease. C) respiratory diseases in cities will increase. D) land and labor will no longer be economic factors.

Some flea beetles escape from a ship and fly to a small island covered with grass but with no trees or beetle predators. As the beetles feed, they destroy all the grasses

But with abundant food, the beetle population soars, doubling in size every month. After about a year, the population crashes as thousands of beetles have destroyed almost all of the plants, and there is little left to feed the large population. This scenario best illustrates ________. A) the fact that the beetles have strong competition from other species for food supply B) a population that has stabilized near its carrying capacity C) exponential growth followed by a population crash D) constant growth followed by equilibrium

Map scale is best defined as

A) the meaning of the symbols used in the map. B) the flattening technique used to "unroll" the globe onto a plane. C) the ratio of a map to the distance or area in the real world. D) the study of the size and shape of Earth. E) the directionality of the map.