Which layer in the figure below can be thought of as the weather layer? 
Definitions:
Sedimentation Rate
A blood test that measures how quickly red blood cells settle at the bottom of a test tube, indicating the presence of inflammation in the body.
Fibrin
A fibrous, non-globular protein involved in the clotting of blood, formed by the action of the enzyme thrombin on fibrinogen.
Leukapheresis
A medical procedure that involves the separation and removal of white blood cells from the blood.
Erythrocyte Sedimentation Rate (ESR)
A blood test that measures how quickly erythrocytes (red blood cells) settle at the bottom of a test tube that contains a blood sample.
Q2: What type of weathering has altered the
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