Unlike other cancers, the vast majority of skin cancers have no potential to spread to other parts of the body (metastasize) and become life-threatening. There are two major types of skin cancer: basal cell carcinoma (the most common) and squamous cell carcinoma (the second most common). Melanoma is also a form of skin cancer but is far less common, though more dangerous, than the other two varieties.
The definition of backfill is material used to refill a hole, usually what was previously dug out of the hole. Dirt and gravel are examples of backfill. Backfill is defined as to return soil and other materials to a hole after it was dug.
Department means a department at the university that conducts work in. excavations. Excavation means any man-made cut, cavity, trench, or depression in an earth. surface formed by earth removal. Faces or sides mean the vertical or inclined earth surfaces formed as a result of. excavation work.