Which of the Following Best Matches the Description

Which of the following best matches the description?
-Physical and chemical processes involved in the breakdown of parent material into soil.

A) weathering
B) parent material
C) friable
D) soil profile
E) humus
F) chemical weathering
G) terrace
H) soil structure
I) terrace.
J) mechanical weathering
K) leaching
L) contour farming
M) loam
N) horizon
O) windbreak
P) soil texture
Q) lithosphere
R) asthenosphere