In the mid-twentieth century, researchers dredging the seafloor could not find any materials older than ________
A) 10,000 years
B) 1.2 million years
C) 180 million years
D) 1.5 billion years
Answer: C
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The term demographic transition refers to
a. a requirement for a population to reach a specific size before it becomes stable b. the slowing down in the growth of a population as it approaches the carrying capacity c. the decline in death rates followed by decline in birth rates when a country becomes industrialized d. the decline in death rates followed by a decline in birth rates that occurred when the germ theory of disease was discovered e. a stabilization of crude birth rates
Oil and natural gas in SE Asia is most likely to be found
A. Along the Wallace Line B. In tropical zones with abundant vegetation C. In areas that experience frequent earthquakes D. In the region's coastal seas and gulfs
A 2-kg mass is held 4 m above the ground. What is the approximate potential energy of the mass with respect to the ground?
A) 20 J B) 40 J C) 60 J D) 80 J E) none of the above
In the Cretaceous period of earth history there is clear evidence that the climate was much warmer than today
It was so warm that areas near the pole had tropical vegetation like palm trees, and there was almost certainly no sea ice and glaciers probably only existed at very high altitude. This produced widespread anoxia (stagnant, no-oxygen condition) on the floor of the oceans. From your knowledge of ocean circulation, which of the following explanations could account for the anoxia? A) The water got so warm it couldn't hold any oxygen, stagnating the water column. B) The lack of polar sea ice stopped any thermohaline deep circulation in the oceans, stratifying the water column to produce anoxia in the deep sea. C) The greenhouse affect led to so much CO2 in the atmosphere that animals all died from lack of oxygen, stagnating the oceans. D) The greenhouse affect made planktonic algae grow so fast that they filled the ocean with algae, stagnating the ocean.