Attack from outside forces
Texas was annexed in 1845, and Oregon was Spain's territory.
He thought slavery would be decided by the civil war
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
Answer:
they provide a variety of vitamins and minerals and are often fortified with nutrients like Ca,B12, and vitamin D(13).