By 2050, what proportion of the world's population is expected to live in urban areas?
A. one-fourth
B. one-third
C. one-half
D. two-thirds
E. nine-tenths
Answer: D
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If the rate at which we produce CO2 were to stop rising, the levels of CO2 in the atmosphere would
A. This cannot be reasonably predicted. B. decrease as CO2 is absorbed by plants, soils, and the oceans. C. eventually level off. D. continue to rise.
How does a seismograph work?
A) Sensitive triggers record digital signals and change them into binary so computers can analyze the data. B) Fluid-filled sensors register shaking signals and feed them to recorders. C) Rotating drums are marked by pens when Earth shakes. D) Infrared movement sensors are wired to an inverter that changes the signals to binary so computers can analyze the data.
In La Conchita, California, landslides have been precipitated by ____
A)periods of heavy rainfall B)earthquakes C)deforestation D)dam failures E)fracking
Alpine tundra vegetation is characterized by evergreen needleleaf trees
Indicate whether the statement is true or false