Seismology has provided critical data for modeling Earth's interior
What will be an ideal response?
P-waves slow down at the mantle core boundary, so we know the outer core is less rigid than the mantle.
S-waves disappear at the mantle core boundary, so the outer core is liquid.
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Over the last 90 years in the United States,
A) the total area of forests has been reduced by about 90%. B) the total area of forests has increased in size. C) most national forests have been clear-cut and converted to agriculture. D) most national forests have been replaced by commercial development.
Discuss three challenges faced by cities as urbanization expands.
What will be an ideal response?
Almost half of the world's people speak languages belonging to the ____________ language family.
a. Indo European b. Sino-Tibetan c. Austronesian d. Trans-New Guinea e. Afro-Asiatic-Indo-European
How much is sea level expected to rise this century due to thermal expansion and melting of glacial ice
as Earth warms? a. 1 to 3 meters b. 3 to 6 meters c. 6 to 9 meters d. 9 to 12 meters e. 12 to 15 meters