Question

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site d 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 1.
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
(1) oceanic divergent
(3) ocean - ocean convergent
(6) hot spot in an ocean
(5) continental collision
(4) ocean - continent convergent
(7) hot spot in a continent
(2) continental rift

Explanation:

Site D describes volcanoes on top of a mountain - belt near the edge of the continent with light - colored and gray volcanic rocks and older intrusive rocks. This is characteristic of an ocean - continent convergent boundary where an oceanic plate subducts beneath a continental plate, melting the mantle and causing magma to rise and form volcanoes and intrusive rocks.

Answer:

(4) ocean - continent convergent