Jump to content

Geography vocabulary: Difference between revisions

(→‎volcano: building up section)
Line 273: Line 273:


* formed when magma from below breaks through the earth's crust
* formed when magma from below breaks through the earth's crust
** lava, ash, and gasses escape
** when that happens, lava, ash, and gasses escape from the earth's hot mantle
** as lava accumulates, volcanic mountains, below and above the sea form
** as lava accumulates and hardens, volcanic mountains, below and above the seas form
* two principle of volcanos:
** conical volcano
*** the most common type of volcano with high walls and a cone at the top
*** built up by layers (or "strata") of lava and other airborne, solid "fragments" of ash and cinders
*** in a conical volcano the lava flow hardens before spreading far
**** stratovolcano (or composite volcano from layers of lava flows), spatter cone (from a lava fountain)
**** see also cinder, rootless, and tuff cones: Volcanic cone - Wikipedia
** shield volcanos
*** the lava flows outward and the volcano does not build up like a conical volcano
* there are various types of volcanic eruptions
* the earth's crust itself is originally built of lava
* the earth's crust itself is originally built of lava
** = "igneous rock"
** = "igneous rock"