Laryngomalacia is the most common cause of chronic stridor in children younger than two years. It has a male-to-female ratio of approximately 2:1.1 The condition is due to an intrinsic defect or delayed maturation of supporting structures of the larynx.
Volcano Rocks Igneous Rocks. Introduction Volcano rocks are igneous rocks that form during a volcanic eruption. They were all once magma which is molten rock beneath the Earth's surface. There are four major groups of the igneous rocks: basalt, andesite, dacite and rhyolite. Each of these different rock groups form different types of volcanoes. Volcanic rocks forming during eruption of Kilauea, USGS Rhyolite rocks Rhyolite magma cooling underground forms granite.
Basalt, cider, Obsidian, foamed obsidian & others are types of ingeous rock, Volcanic Rock. Liquid rock is not always called lava. When the liquid rock is still underground it is called magma. The differences between magma and lava is basically made to make geological occurrences easier to understand and explain. A volcano erupts when there is sufficient pressure underground from magma that contains gas bubbles.