The plate tectonic activity that gave rise to orogens around much of the circum-Pacific orogenic belt was ____________________
Fill in the blank(s) with correct word
subduction
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The ___ is the seismic discontinuity that defines the boundary between the crust and the mantle.
Fill in the blank(s) with the appropriate word(s).
Because poor countries may be dependent on the export of just one or two raw materials, the welfare of their people rises and falls with world prices over which they have no control
Indicate whether the statement is true or false.
What is an aerial burst?
A) an explosion in the asteroid belt that sends asteroids hurtling toward Earth B) a secondary explosion above an impact crater, occurring after impact C) a meteor bursting into many smaller pieces when bombarded with nuclear weapons D) an explosion of a meteor entering the Earth's atmosphere
Which of the following locations would contribute to mid-latitude cyclogenesis?
A. where air converges and accelerates as it passes from an upper air ridge to an upper air trough B. where air converges and slows as it passes from an upper air trough to an upper air ridge principles C. where air spreads out and accelerates as it passes from an upper air trough to an upper air ridge D. where air spreads out and accelerates as it passes from an upper air ridge to an upper air trough