Answer: velocity
Explanation: trust me man
You forgot to attach the text
BTW reduction is the action or fact of making a specified thing smaller or less in amount, degree, or size.
C and D
surface water is evaporated by the sun and concentrated the ocean salt and oceans are diluted when rivers flow into them
is the Calcium
because the calcium in group two which group two has 2 electron and also calcium and Potassium 4s sub level group potassium has 1 electron. :)