Aglio e olio-- garlic, olive oil and parsley; Alfredo-- butter, cream and freshly grated cheese served with fettuccine; Amatricana-- sauce of fresh tomatoes, chopped bacon, onion and garlic, served with grated Pecorino Romano cheese; Bolognese-- rich meat sauce flavored with chicken livers, wine, vegetables and nutmeg.
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.
Volcanoes and Volcanic Eruptions. Magmas and Lava. Since volcanic eruptions are caused by magma (a mixture of liquid rock, crystals, and dissolved gas) expelled onto the Earth's surface, we'll first review the characteristics of magma that we covered previously. Three basic types of magma: