Aseries of closed contour lines would most likely represent which of the following?
a) hill
b) ridge
c) valley
d) spur

What geologic process is related to caldera formation?

Identify the youngest layer in the figure ( have to click one letter)

Liquefaction is a. a quicksand-like condition arising in some wet soils during earthquakes. b. flooding caused by tsunamis. c. flooding of coastal areas due to tectonic subsidence. d. flooding caused by dam failure resulting from an earthquake.