Question

site a the source of igneous activity would be ______________. 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 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 b: circular volcanic depressions on land, which are filled with light - colored volcanic ash and light - colored volcanic rocks samples 2 and 3 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 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 (8) other (3) ocean - ocean convergent (1) oceanic divergent (2) continental rift (7) hot spot in a continent (5) continental collision (6) hot spot in an ocean (4) ocean - continent convergent

Explanation:

Site A describes a line of volcanic islands and submarine mountains with broad volcanoes forming dark volcanic rocks, which is characteristic of an ocean - ocean convergent plate boundary where one oceanic plate subducts beneath another, leading to volcanic activity.

Answer:

(3) ocean - ocean convergent