← Volcanoes Rozycki Test
5 Written Questions
5 Matching Questions
- island arc
- Andesitic Lava
- lava flow
- a A lava of intermediate composition that has a higher silica content than basalt, erupts at lower temperatures, and is more viscous. Extrusive equivalent of diorite. Found at subduction zones.
- b The area convered by lava as it pours out of a volcano's vent
- c said of a volcano that does not show signs of erupting in the near future
- d A string of islands formed by the volcanoes along a deep ocean trench.
- e A slab of volcanic rock formed when magma squeezes between layers of rock laying horizontal.
5 Multiple Choice Questions
- large mass of intrusive igneous rock believed to have solidified deep within the earth
- the pocket beneath a volcano where magma collects
- The large hole at the top of a volcano formed when the roof of a volcano's magma chamber collapses.
- Active strato-volcano in Washington state which erupted in 1980 and was the deadliest and destructive volcanic eruption in the U.S.
- Liquid magma that reaches the surface; also the rock formed when liquid lava hardens.
5 True/False Questions
hot spot → An area where magma from deep within the mantle melts through the crust above it.
Basaltic Magma → The lava that is richest in silica, making it the stickiest and least fluid kind of lava. It erupts at temperatures of only 600 to 800 C. Highly explosive, found at continental hot spots and subduction zones.
active volcano → A wide, gently sloping mountain made of layers of lava and formed by quiet eruptions.
composite volcano → A tall, cone shaped mountain in which layers of lava alternate with layers of ash and other volcanic materials. Most violent of eruptions.
shield volcano → A wide, gently sloping mountain made of layers of lava and formed by quiet eruptions.