Question

tectonic settings of igneous activity
the area below has five sites, labeled a, b, c, d, and e, where igneous activity has been observed. for each site, consider the igneous processes responsible for the activity, such as the type of plate boundary or other feature. possible choices are listed in table i.
site a: a line of volcanic islands and submarine mountains. broad volcanoes on the islands are forming dark volcanic rocks sample 1
site b: circular volcanic depressions on land, which are filled with light - colored volcanic ash and light - colored volcanic rocks samples 2 and 3
site c: a volcanic ridge that zigzags across the ocean floor. the rock sample is dark colored and is from a lumpy lava flow on the seafloor. sample 4
site d: volcanoes on top of a mountain belt near the edge of the continent. the volcanoes erupt light - colored and gray volcanic rocks. older intrusive rocks, some with coarse crystals, are also exposed. samples 5, 6, and 7
site e: a chain of volcanic islands adjacent to an oceanic trench. the volcanoes erupt gray volcanic ash and lava flows. there are also some intrusive rocks. samples 8 and 9
letter e is an example of a(n)?
(1) oceanic divergent
(2) continental rift
(3) ocean - ocean convergent
(4) ocean - continent convergent
(5) continental collision
(6) hot spot in an ocean
(7) hot spot in a continent

Explanation:

At site E, there is a chain of volcanic islands adjacent to an ocean - ocean convergent boundary. In an ocean - ocean convergent setting, one oceanic plate subducts beneath another, leading to volcanic activity and the formation of island arcs. This matches the description of site E.

Answer:

(3) ocean - ocean convergent