What process occurs as new layers of sediment are added to old layers of sediment, causing pressure on the older layers?
•weathering
•erosion
•cementation
•deposition

it is prolly d and c and f

the answer to you question is   jet streams

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

2%? i tried finding the exact sorry if it's not 100% correct ; -;