Calderas range in size from less than 1km to tens of kilometers across. What do they all have in common?
A) They all form by subsidence of the caldera center due to withdrawal of magma from below.
B) They all form from collapse of composite volcanos following explosive eruptions; Crater lake is an example.
C) They all are formed in rhyolitic volcanos and have associated eruptions of ash flow tuff.
D) They all form in explosive eruptions.
A
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Clays can remain suspended in the water column for decades before settling due to their small size
a. True b. False
The high parts of the waves are called ________
A) breakers B) bumps C) crests D) hills E) tops
Which statement is more accurate?
A) Every parallel begins and ends at the poles. B) Every meridian is actually a circle rather than a curved line. C) Every meridian is the same length and has the same beginning and end. D) Every meridian is distorted by magnetic declination. E) Every parallel is the same length.
The location of Washington, D.C. as the U.S. capital was made possible by a compromise between northern and southern states in 1790. What decision was analogous in Australia?
A. Melbourne and Sydney were competing to be the the national capital, so they built the new capital, Canberra, halfway between the two. B. Since Australia's population is evenly split between southeast and southwest coasts, Adelaide on the south coast was made the capital. C. White Australia's wanted an English name for the capital, but aborigines wanted an indigenous name, so the compromise was Canberra, which means "meeting place." D. Canberra's layout was designed by Chicago architects Walter Burly Griffin and Marion Mahony Griffin.