In northern Canada, much of the hard rock found is igneous rock. Igneous rock is rock formed by the hardening and crystallization of molten material that originates deep within the earth. The word igneous comes from the Greek word for fire; some people call igneous rock a fire ball rock. Rocks that have hardened from magma, the hot liquid beneath the earth's crust, are called igneous rocks. The inside of the earth is very hot - hot enough to melt rocks. The deeper you get the hotter it gets. Below the surface, the molten rock is called magma; at the earth's surface it becomes lava, nothing has changed only the name of the liquid. Igneous rock is made by fire. Small wonder the magma from which igneous rock is formed can reach temperatures close to 1200 degrees Celsius.
Posterior fossa tumors lie on the underside of the brain. These tumors can compress the cranial nerves causing facial symptoms or loss of hearing. Petroclival tumors can compress the trigeminal nerve, resulting in sharp pain in the face (trigeminal neuralgia) or spasms of the facial muscles.
Trigeminal neuralgia (TN) is a condition that causes repeated (recurring) severe pains in parts of your face. It usually affects people aged over 50. Treatment with a medicine called carbamazepine usually works well to stop the pains.