Iodine-131 (usually in the chemical form of iodide) is a component of nuclear fallout, and is particularly dangerous owing to the thyroid gland's propensity to concentrate ingested iodine, where it is kept for periods longer than this isotope's radiological half-life of eight days.
Magma is composed of molten rock and is stored in the Earthâs crust. Lava is magma that reaches the surface of our planet through a volcano vent. Lava flow, Hawai. Courtesy of the U.S. Geological Society.agma is composed of molten rock and is stored in the Earthâs crust. Lava is magma that reaches the surface of our planet through a volcano vent. Lava flow, Hawai. Courtesy of the U.S. Geological Society.
Lava. Lava is molten rock erupted at the ground surface. When molten rock is beneath the ground, it is called magma. 1  Lava flows are the effusive (non-explosive) outpourings of lava, and usually flow slower than walking pace. 2  Lava flow types include aâa, blocky and pahoehoe.ultiple types of eruptions can occur at each of New Zealandâs volcanoes-the eruption type can vary minute to minute.