During orogeny, what kinds of igneous activity can occur?
a. At transform boundaries, melting may take place where deep portions of the crust undergo heating
b. In convergent plate boundaries, melting takes place in the mantle above the subducting plate
c. In rifts, stretching and thinning of lithosphere causes decompression melting (i.e.,
melting due to the decrease of pressure) of the mantle
d. During continental collision, melting may take place where deep portions of the crust undergo heating
e. Both b, c, and d
Ans: e. Both b, c, and d
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Why is topographic monitoring sometimes useful in forecasting a volcanic eruption?
A) A volcano sometimes swells as lava moves into the edifice. B) Volcanic eruption is more likely as an area undergoes tectonic uplift. C) Seismic activity occurs as the volcano rises. D) Topographic monitoring reveals the likelihood of lahar generation.
A substance that forms an inorganic, natural compound with a specific chemical composition is called a
A) molecule. B) tectonic rock. C) granitic compound. D) mineral. E) element.
Earth's initial atmosphere formed from ________
A) leftover gases from the nebula B) the Sun's solar wind C) outgassing D) comet vaporization
When all of the Milankovitch cycles are taken into account, the present trend should be toward ____ over high latitudes of the Northern Hemisphere
a. warmer winters b. warmer springs c. warmer summers d. cooler summers e. cooler winters