C) near the mouth
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The mouth is where the river flows into another body of water and there is least oxygen here. The river slows down here and that decreases dissolve oxygen.
When you are walking across a room, the first law comes into play because the external force moving you forward is you muscles, the second law because the force your muscles are enacting on you are relatable to your mass and acceleration, and the third law because the floor is pushing up on you as you push down on the floor.
I would like to say A. but im not fully sure on this one
The answe is c erosion disappered
Answer:The volume of the liquid should be measured before it is heated. Because During an experiment to test how a variable changes a substance, it is important to first observe and record the characteristics of the substance before the variable is introduced. In this case, the variable is heat energy.
Explanation:
Forgot to measure the volume in the beginning so the student could tell the difference