There are three main types of volcano-composite or strato, shield and dome. Composite Volcanoes. Composite volcanoes, sometimes known as strato volcanoes, are steep sided cones formed from layers of ash and [lava] flows.The eruptions from these volcanoes may be a pyroclastic flow rather than a flow of lava.A pyroclastic flow is a superheated mixture of hot steam, ash, rock and dust.omposite volcanoes, sometimes known as strato volcanoes, are steep sided cones formed from layers of ash and [lava] flows. The eruptions from these volcanoes may be a pyroclastic flow rather than a flow of lava. A pyroclastic flow is a superheated mixture of hot steam, ash, rock and dust.
Desalination plants typically use reverse osmosis, a process that pushes saltwater through a membrane to create purified, drinking water. But in addition to being costly, and energy-intensive, reverse osmosis can negatively impact the environment.
âSea water may be desalinated if passed through sand, for the particles of sand obstruct the long, rigid particles of salt while letting water particles through.â âThe disadvantage in desalinating seawater is that it is very energy hungry, and we find that the cost is at least double that of producing a very high quality from a municipal wastewater.â