What groundwater feature forms where the water table intersects with the Earth's surface, creating a natural outflow of groundwater?
A) Fumarole
B) Sinkhole
C) Lake
D) Spring
Answer: D
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A heavy stone is launched straight upward at 100 m/s. If air resistance can be neglected, the time to reach its maximum height is
A. more than 20 s. B. 10 s. C. 20 s. D. none of the above
After 1979 the ________________ fought troops of the Soviet Union and then each other for control of Afghanistan.
Fill in the blank(s) with the appropriate word(s).
How do scientists use lake sediments to study past climates?
A) Lake sediments contain organic materials that can be identified to species and radiocarbon dated, thereby giving insight into past plant communities and related climatic conditions. B) Isotopic analysis of the relative proportions of 18O to 16O enable determination of evaporation rates from ancient lakes. C) During warmer conditions, lake sediments form wider rings, whereas in cooler conditions, these rings are narrower. D) The amount and type of pollen in lake sediments is an indication of the macrovertebrate assemblages that dominated an area. E) Lake sediment analysis is used to determine which fish species have persisted in a particular lake over long periods of time.
The most important factor in determining which biome is found in a particular area is
A. soil type. B. topography. C. magnetic fields. D. climate. E. rock cycle.