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.
Systemic sclerosis (systemic scleroderma) is a chronic connective tissue disease of unknown etiology that causes widespread microvascular damage and excessive deposition of collagen in the skin and internal organs. Raynaud phenomenon and scleroderma (hardening of the skin) are hallmarks of the disease.The typical patient is a young or middle-age woman with a history of Raynaud phenomenon who presents with skin induration and internal organ dysfunction.aynaud phenomenon and scleroderma (hardening of the skin) are hallmarks of the disease. The typical patient is a young or middle-age woman with a history of Raynaud phenomenon who presents with skin induration and internal organ dysfunction.