Answer:
It is a example of erosion
Explanation: because pieces of rock erode making it unstable a causes a landslide
A .gamma
Because composed of photons, which have neither mass nor electric charge and, as a result, penetrates much further through matter than either alpha or beta radiation.
Answer : The concentration of benzoic acid in this solution was, 0.149 M
Explanation :
The balanced equilibrium reaction will be,

initially conc. c 0 0
At eqm. c(1-α) cα cα
The expression for dissociation constant is:

when α is very very small the, the expression will be,

Given:
α = 2.05 % = 0.0205

Now put all the given values in this expression, we get:

c = 0.149 M
Therefore, the concentration of benzoic acid in this solution was, 0.149 M
C.
They broke down materials by chemical means