It can be caused by the humid air or surrounding.
Humid air makes the stones absorb water and therfore makes it soft.
The correct answer should be: Bromide
Answer:
Effort = 125 N
Explanation:
Given
Load (L) = 500 N
Load distance (L.D) = 20 m
Effort distance (E. D) = 80 m
Effort (E) = ?
We have the formula that
E * E.D = L * L. D
E * 80 = 500 * 20
80E = 10000
E = 10000/80
E = 125 N
A: The hole in the ozone layer