________ is a dark, fine-grained extrusive rock.
A) Tufa
B) Basalt
C) Granite
D) Conglomerate
E) Shale
Question 2
The complex formation of ________ involves accrual of hydrocarbons from marine organisms, often in association with heat.
A) granite
B) sandstone
C) basalt
D) lava
E) petroleum