Question

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

Explanation:

Oceanic divergent boundaries are characterized by mid - ocean ridges where new oceanic crust is formed as tectonic plates move apart. Site C describes a volcanic ridge across the ocean floor, which is typical of an oceanic divergent boundary. Magma rises to fill the gap between the separating plates, creating new crust and resulting in igneous activity.

Answer:

(1) oceanic divergent