The mixture of molten rock, crystals and dissolved gases from the mantle is called magma. When magma erupts to the Earth's surface, it is called lava. Not all volcanic eruptions happen near the boundaries of tectonic plates. Some eruptions happen in the middle of the plates.These eruptions are caused by mantle streams called plumes. Mantle plumes are formed when hot magma rises beneath the thinner, or weaker, areas of the Earth's crust, creating 'hot spots'. Volcanic islands are formed when mantle plumes form at the bottom of the ocean.ome eruptions happen in the middle of the plates. These eruptions are caused by mantle streams called plumes. Mantle plumes are formed when hot magma rises beneath the thinner, or weaker, areas of the Earth's crust, creating 'hot spots'. Volcanic islands are formed when mantle plumes form at the bottom of the ocean.
Burst Fracture of the Lumbar Spine. General Considerations. Burst fractures result from axial loading most often secondary to motor vehicle accidents and falls. The axial load drives the intervertebral disk into vertebral body below. Usually produces a comminuted, vertical fracture through the vertebral body.
1 As the nerve often passes down in the spiral groove of the humerus, it may be injured with a fracture of the shaft of the humerus. 2  At the elbow: 3  The radial nerve may be entrapped at the elbow at a number of sites but the most common is the proximal border of the tendon of supinator called the arcade of Frohse. May be due to a compression lesion but fracture is the usual cause. 2  Injections given in the arm of small babies can damage the radial nerve. 3  As the nerve often passes down in the spiral groove of the humerus, it may be injured with a fracture of the shaft of the humerus.