The wearing away and removal of rock or sediment is called a.)weathering b.)depostion c.)erosion

a:

by the combination of an unlimited number of elements

the answers would be

the first one and the second one

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