Glossary of Terms. Bronchus / Bronchi / Bronchioles. The airways of the lungs. When a person takes in a breath of air, the air travels through the nose or mouth, into the larynx, then into the trachea, which is the main passageway into the lungs. The trachea divides into a right and left main bronchus.
Plant and animal life, atmosphere and water are the major causes of weathering. Weathering breaks down and loosens the surface minerals of rock so they can be transported away by agents of erosion such as water, wind and ice. There are two types of weathering: mechanical and chemical.
There are two types of weathering: chemical and mechanical. Chemical weathering is caused by chemical reactions between the rock and usually water, which then carries ions away in solution, and mechanical weathering physically breaks bits off of rocks without causing a chemical change. Sedimentary rocks are formed by weathering, erosion, transportation, deposition, and lithification.