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.
You might think itâs a liquid, since volcanoes erupt lava from the mantle. But actually, the mantle is mostly solid rock. Magma is liquid rock that seeps out of the mantle and collects into pockets beneath the crust called magma chambers.ou might think itâs a liquid, since volcanoes erupt lava from the mantle. But actually, the mantle is mostly solid rock. Magma is liquid rock that seeps out of the mantle and collects into pockets beneath the crust called magma chambers.