Igneous rocks are formed from the solidification of molten rock material. There are two basic types. Intrusive igneous rocks crystallize below Earth's surface, and the slow cooling that occurs there allows large crystals to form. Examples of intrusive igneous rocks are diorite, gabbro, granite, pegmatite, and peridotite.
Systemic sclerosis or systemic scleroderma is an autoimmune or connective tissue disease. It is characterized by thickening of the skin caused by accumulation of collagen, and by injuries to the smallest arteries.ystemic sclerosis or systemic scleroderma is an autoimmune or connective tissue disease. It is characterized by thickening of the skin caused by accumulation of collagen, and by injuries to the smallest arteries.
Scleroderma is an autoimmune disorder in which, for unknown reasons, the immune system stimulates cells to produce excess collagen. There are two main types of this disease: 1  Localized scleroderma affects limited areas of the skin and musculoskeletal system; it can make the hands waxen and immobile.cleroderma is an autoimmune disorder in which, for unknown reasons, the immune system stimulates cells to produce excess collagen. There are two main types of this disease: 1  Localized scleroderma affects limited areas of the skin and musculoskeletal system; it can make the hands waxen and immobile.