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.
Weathering is the breakdown of rock by physical, chemical or biological processes. Limestone areas are predominently affected by chemical weathering when rainwater, which contains a weak carbonic acid, reacts with limestone. When it rains limestone is dissolved.ver the years this sediment was compressed to form solid rock. Limestone is formed in layers-called bedding planes. These bedding planes contain vertical cracks called joints. Joints and bedding planes make the rock permeable.