How is the Grand Canyon related to volcanic activity?

In the western Grand Canyon hundreds of volcanic eruptions occurred over the past two million years. At least a dozen times, lava cascaded down the walls of the Inner Gorge, forming massive lava dams that blocked the flow of the Colorado River. ... 1064 a series of eruptions built the park's namesake cinder cone.

hope this helps ^^

ur answer is e & d

explanation:

that is wrong, its not thymus.