This ain’t mine but here is someone else’s
I believe the answer is valcanos because they release sulfur in to the air and other chemicals so it willl affect the anispher
In order to completely describe a velocity,
you need a speed and a direction.
Answer:
0.25miles/min
Explanation:
Instantaneous speed of a person or an object is its speed at a particular moment usually at a period of time.
The speedometer of a car reports the instantaneous speed.
It can be mathematically expressed as;
Instantaneous speed = 
At 20min the distance covered is 5miles;
Instantaneous speed =
= 0.25miles/min