18. All of the following are examples of chemical weathering except
a. acid rain
b. cave formations
c. rocks breaking because of ice
(d, pollution

Chemical weathering are due to chemical reactions

The option which is an exception of the examples of chemical weathering is the option;

C. Rocks breaking because of ice

Reason:

Chemical weathering is the weathering that occurs due to the dissolution of rock compounds, by rain water, oxygen, acids, or living things, forming new compounds

Examples of chemical weathering includes;

Therefore, the option which is an exception is rocks breaking because of ice which is a mechanical weathering process

Learn more about chemical weathering here:

link

C

Explanation:

Rocks breaking because of ice.

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer