Which of the following terms is defined by the measure of mass per unit of volume? gravity
density
weight
acceleration

I'm glad you asked!

Explanation:

Gravity is a force which keeps people from floating around.

Density is usually used for mass or volume.

Weight is how heavy something is.

Acceleration is when something increases in height,speed etc.

The answer is Density.

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.