![]() ![]() Volcanic ash – a mass of molten rock, less than 2 mm in diameter, ejected during volcanic eruptions that cool into solid fragments before they reach the ground. Photo from the United States Geological Survey’s website. Lapilli – In Latin means “little stones”, a mass of molten rock, between 2-64 mm in diameter, ejected during volcanic eruptions that cool into solid fragments before they reach the ground. Basalt Volcanic Bomb, the specimen is from the National Mineral Collection at the National Museum of Natural History, Smithsonian Institute – Volcanic bomb – a mass of molten rock, larger than 64 mm in diameter, ejected during volcanic eruptions that cool into solid fragments before they reach the ground. There are three types of pyroclastic igneous rocks:
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |