contact zones between lithospheric plates can produce deep trenches. One of these trenches occurs at the boundary between which plates?
a. indian-australian and pacific
b. south american and african
c. indian-australian and antarctic
d. north american and eurasian
To determine the answer to this question, we can refer to the map of tectonic plate boundaries. By understanding the different types of plate boundaries and the corresponding geological features, we can identify which contact zone produces deep trenches.
Let's analyze each option against the knowledge of plate boundaries:
a. Indian-Australian and Pacific: The boundary between the Indian-Australian Plate and the Pacific Plate is characterized by a convergent boundary, or a subduction zone. This boundary produces deep oceanic trenches, such as the Mariana Trench and the Tonga Trench.
b. South American and African: The boundary between the South American Plate and the African Plate is a divergent boundary, where the plates move away from each other. It does not produce deep trenches.
c. Indian-Australian and Antarctic: The boundary between the Indian-Australian Plate and the Antarctic Plate is a divergent boundary as well, not leading to deep trenches.
d. North American and Eurasian: The boundary between the North American Plate and the Eurasian Plate is a transform boundary, where the plates slide past each other horizontally. Transform boundaries do not typically generate deep trenches.
Based on the analysis, the correct answer is option a. The trenches occur at the boundary between the Indian-Australian and Pacific Plates.