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 a condition in which a type of connective tissue in the body called collagen is overproduced. It can be localized, leading to hardened patches or bands of skin, the tissue that lies immediately below the skin and sometimes the muscles of the arms, legs or forehead.his acronym refers to the group of symptoms that may be found to some degree in most cases of limited cutaneous scleroderma, which generally affects only the arms, fingers, legs, face and neck. CREST symptoms are calcinosis, Raynaud's, esophagus, sclerodactyly, telangiectasias.