Asked by April Thompson on Jul 04, 2024
Verified
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.
Wrangellia Terrane
A geological region composed of igneous and metamorphic rocks, originally formed as an island arc, and now part of the coastal regions of British Columbia, Alaska, and Yukon.
Fault Line
A fracture or zone of fractures between two blocks of rock, allowing the blocks to move relative to each other, often associated with earthquakes.
Sequences of Rocks
The order and position of layers of rock, indicating their relative ages and the geological history of a region.
- Clarify the function of hot spots in the genesis of diverse landforms and their significance within geological studies.
Verified Answer
VF
Victoria FabiilliJul 06, 2024
Final Answer :
A
Explanation :
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.
Learning Objectives
- Clarify the function of hot spots in the genesis of diverse landforms and their significance within geological studies.