1. A shield volcano forms when quiet eruptions over time produce lava flows that run over land (and can spread out) and cool and harden into volcanic rock. Overtime, these layers of volcanic rock build on-top of each other to make a gently sloping shield volcano. (Example: Kilaeua)
2. Composite volcanoes form when repeated eruptions of pyroclastic flow (cooling volcanic rock particles of ash, cinder, and bombs) build up on each other. These are often steep, cone-shaped mountains. (Example: Paricutin)
3. Eruptions of lava flows (quiet) and pyroclastic flow (explosive) alternate to form composite volcanoes. The volcano is then built up of a layer of ash, cinders, and bombs and then a layer of lava over and over again. The volcanoes have a steeper slope at the top and then a gentler slope at the bottom. (Example: Mt. St. Helens)
4. Often the soils produced from volcanic eruptions and volcanic rock are actually high in nutrients and can be good to grow crops.
5. See above
Subscribe to:
Post Comments (Atom)
0 comments:
Post a Comment