The theory that us understand earthquakes and volcanic activity is

The Earth rumbles and a hiss of steam issues from the top of Mt Ruapehu. Are these two events related? Is the earthquake caused by the volcano? Or is the steam caused by the earthquake?

When Alfred Wegener first proposed the idea of continental drift (the precursor idea to plate tectonic theory), it didn’t quite explain the full story. While he correctly showed that Africa and South America fitted together, his model wasn’t able to explain the violent forces that occur around the Earth’scrust.

answer; native americans who sometimes actively impeded railroad construction; physical obstacles like rivers and canyons, and

i'm sure the answer you are looking for would be

a. an ice age

hope this contact me if this didn't or you need with more answers : )