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.
Rating Newest Oldest. Best Answer: Magma is the the molten rock that is underneath the crust of the earth. The crust of the earth is actually floating on the magma underneath. Lava is the term used to describe magma when the magma has seeped through the earth's crust. For example, during a volcanic eruption.Magma has seeped through the crust and is now called lava.ating Newest Oldest. Best Answer: Magma is the the molten rock that is underneath the crust of the earth. The crust of the earth is actually floating on the magma underneath. Lava is the term used to describe magma when the magma has seeped through the earth's crust. For example, during a volcanic eruption.