A volcano is a vent or fissure in Earth's crust through which lava, ash, rock and gases erupt. A volcano is also a mountain formed by the accumulation of these eruptive products.Let's take a look at how volcanoes form: Earth's crust is 40 to 250 miles (64 to 402 kilometers) thick.irborne fragments of lava, called tephra, are ejected from a single vent. The lava cools rapidly and builds up around the vent, forming a crater at the summit. Cinder cone volcanoes are fairly small, generally only about 300 feet (91 meters) tall and not rising more than 1,200 feet (366 meters).
10 hilariously insightful foreign words. The glossopharyngeal nerve is also called the ninth cranial nerve. Cranial nerves are vital nerves that arise from the brain that help the brain control muscles, process the five senses, and control glands in the body.
The 12 Pairs of Nerves That Emerge Directly From The Brain. Cranial Nerve #9: Glossopharyngeal Nerve. Description and Physiology. The glossopharyngeal nerve originates from the brainstem and has both sensory and motor functions. The term glosso means âpertaining to the tongue and pharyngeal means âpertaining to the pharynxâ.