The crusades strengthened the power of the. serfs in europe increased european isolation
I think its b because people usually say "I plead the fifth"
Answer: It was the Greeks
The answer is Erosion, which is the the gradual destruction or diminution of something -- in this case, rocks. I hope this helps! For reference/perspective, sand is the product of rock erosion, because it's really just tiny remnants of crushed rock. Those "small pebbles" could be sand, but you'd have to emphasize just how small they are -- one grain of sand is just that: a grain
