The first major Paleozoic transgression onto the North American craton was the ____ sequence
a. Tippecanoe
b. Kaskaskia
c. Sauk
d. Taconic
e. Appalachian
c
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The igneous feature shown in this figure is a
A) dike.
B) sill.
C) volcanic neck.
D) laccolith.
Smoke released from a stack into a very stable air mass would tend to:
A) spread out horizontally but not mix up or down. B) mix rapidly downward. C) mix both upward and downward. D) go almost straight up. E) diffuse rapidly in all directions.
The Mohorovi?ic´ discontinuity ____
a. does not lie at a constant depth but generally mirrors surface topography b. marks the edge of continental shields c. is defined as a boundary exactly 10 kilometers below the surface d. marks the boundaries between oceanic and continental plates e. is absent in some parts of the Earth
the geothermal gradient, on average, is about _____.
What will be an ideal response?