A geologist discovers a new rock formation. The rock is dark in color and appears to have formed in layers. The layers are thick and not parallel but instead show some folding.

Question

Which type of rock did the geologist most likely find?

gneiss
marble
slate
quartzite

Answer 1

Based on the description provided, the geologist most likely found gneiss. Gneiss is a metamorphic rock characterized by its dark color and layered texture, which can include folding and thick layers. The other options listed (marble, slate, and quartzite) have different characteristics that do not align as closely with your description of a rock forming in thick, non-parallel layers that show some folding.