Numerous terranes exist in Alaska. One of these is the Wrangellia terrane. Why is the Wrangellia terrane considered part of the same terrane as that from pieces scattered from western Idaho northward to Alaska?
A) The terranes have similar ages and sequences of rocks.
B) The terranes are joined by a single fault line.
C) The terranes are of distinctly different rock types from each other.
D) The terranes were formed during increasingly older times as they progress northwest.

Question

Quizplus · Accepted Answer

The Wrangellia terrane and other pieces scattered from western Idaho northward to Alaska are considered part of the same terrane because they share similar ages and sequences of rocks. This geological similarity suggests that they were once part of the same landmass or formed under similar conditions before being dispersed to their current locations.

Numerous Terranes Exist in Alaska