The faster a sound wave travels, the more distance it will cover in the same period of time. If a sound wave were observed to travel a distance of 700 meters in 2 seconds, then the speed of the wave would be 350 m/s. A slower wave would cover less distance-perhaps 660 meters-in the same time period of 2 seconds and thus have a speed of 330 m/s.
Melanoma Definition. Melanoma is a form of skin cancer that arises from melanocytes-the cells that produce pigment. Melanoma may begin in association with a mole. Melanocytes produce a pigment called melanin that gives the skin its colour and protects it from sun damage.
Malignant Melanoma. Melanoma is the deadliest form of skin cancer, as it has the potential to spread to other parts of the body. This form of cancer in skin pigment cells is often caused by the sunâs ultraviolet ray, which damage skin cells and causes the cells to divide uncontrollably. Fair-skinned individuals with red hair, multiple moles, and with a history of frequent sunburn episodes have a higher risk to develop malignant melanoma.