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.
Mechanical weathering is a process where big rocks are broken down to smaller fragments due to physical forces acting on them. Read more about what causes mechanical weathering by going through the following article.echanical weathering involves physical activities leading to break down of rocks and chemical weathering involves natural chemical reactions leading to decomposition of the rocks.