4. Complete the description of the environment in which coarse-grained igneous rocks form by choosing the appropriate terms: (1. at great depth or on the surface) (2. slowly or rapidly) (3. extrusive or intrusive). When molten rock solidifies (1) , it cools (2) and produces an (3) igneous rock. Tarbuck, Edward J.. Applications and Investigations in Earth Science (p. 31). Pearson Education. Kindle Edition.