He was looking proud when he heard that his son had been accepted to college.

He is proud of his son's success.

My diet is rich in protein.

His constitution makes him prone to catching colds.

The aerosol in this area is very dense.

This wall is made of chalky material.

The white matter in the brain plays a role in transmitting signals of nerve cells.

Saccharides are an important source of energy for our bodies.

The bottom sediment of this lake is mainly composed of sand and mud.

He has a susceptibility to depression, and tends to get down over little things.