Which statement about the theory of plate tectonics is correct?
a. The rigid lithosphere plates ride over a pool of magma.
b. The rigid asthenosphere plates overlay the hotter and weaker lithosphere.
c. The rigid asthenosphere plates overlay the crust.
d. Rigid lithosphere plates move through oceanic crust.
e. The rigid lithosphere plates overlay the hotter and weaker asthenosphere.
e. The rigid lithosphere plates overlay the hotter and weaker asthenosphere.
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Besides geographic fit of continents, what other evidence did Alfred Wegener study to support his theory of continental drift?
A) ?Coal and fossilized remains of tropical plants are absent in frigid Antarctica. B) ?Differences in fossils are found across separated continents. C) ?Ice core samples indicate similar CO2 measurements at both poles. D) ?The alignment of mountain ranges has a similar age, composition, and structure on both sides of the Atlantic.
Pollution is most severe in urban areas when a ____
A) cold upper-level low moves into a region B) cold front passes through the area C) large slow-moving anticyclone moves into an area D) storm system begins developing to the west
Which device splits one hose stream into two hose streams?
a. Siamese b. Water thief c. Wye d. Splitter
Why are different parts of a continent often different ages?
A. Igneous, sedimentary, and metamorphic rocks were all created at different times, so these different types of rock yield the different ages. B. Different ages only mean that different radiometric isotopes have been used to date the different parts; rocks on one continent are the same age. C. Different ages of terranes may be accreted onto continents, and newer-aged sedimentary rocks or volcanic rocks are deposited on top of older rocks.