The stem or most basic part of a word that retains meaning is called:
a. affix
c. suffix
b. prefix
d. root

i named my duck w e i n e r

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

here's your answer.

cells spend most of their time in interphase