Which of these is still affecting north america geologically, although it ended 10,000 years ago?

a. an earthquake

b. the last glaciation

c. a major subsidence

d. chemical erosion of the grand canyon

The last glaciation would be the best answer. This is because earthquakes, subsidences, and chemical erosions in the Grand Canyon are still occurring as of right now whereas the last glaciation happened roughly 10,000 years ago.

B. The last glaciation. 

Answer(say);