Stroke (which is a cerebral embolism, or cerebral vascular accident) is characterized by damage to a part of the brain (which could for example the sensory cortex) as a result of obstruction of a vessel (ischemic stroke or cerebral infarction) or by the rupture of a blood vessel and the accumulation of a pocket of blood (hemorrhagic accident or cerebral hemorrhage).
The sensory and visual symptoms of the stroke appear 48 hours after the incident, Doctors must act quickly to save the patient from irreversible damages.</span>
Magma is less dense than the surrounding rock which causes it to rise. When magma reaches the surface it is then called lava and the eruptions of lava and ash produce volcanoes. The lava that reaches the Earth's surface will harden and become igneous rock.
