The rock will be broken down to sediments by water erosion.
Germany would have won the war.
the amount of dissolved oxygen would decrease.
1) The most obvious is that a boulder is significantly larger than a pebble or smaller boulder or rock. This would give the illusion of a smaller pebble weathering quiker than a boulder, when they are actually weathering at the same rate 2) The way they are being weather can be a factor. If you have a boulder being hit by only water or air while a pebble is all over the river bottom and sand than the pebble will weather quicker because there are more forces acting on it than the boulder.
The river would flood cities near the Mississippi River.
it falls lol
well first of all if there is too much irrigation the river would get dirty and animals would die
boulder holder
It would erode and maybe crack
it can be pollution
The river would flood downstream.
It would be potential energy as long as the boulder stays still.
Vampires, forever cursed by the mark of God, would probably keep away from something that was so pure, just in case... As angles are immortal (whether they are fallen or not) they would never die and the vampire traits would never become applicable.