'Low gas content' diaporamas de présentation

Volcanoes

486 views • 34 slides

Chapter 12

Chapter 12. Volcanoes. Introduction. A volcano is the opening in the Earth that erupts gases, ash and lava. There are over 1500 volcanoes in the world. Over 600 are currently active. 169 volcanoes in the Unites States are currently active. Being monitored by the USGS

341 views • 34 slides

Intrusive and Extrusive Igneous Rock Structures

Intrusive and Extrusive Igneous Rock Structures. Basalt dikes hosted in a granitoid pluton , with metasediment roof pendant; Wallowa Mts , Oregon . Intrusive (Plutonic) Magma cools slowly at depth Characteristic rock texture Characteristic structures. Igneous Structures.

2.17k views • 24 slides