science(chptr 7) #4
Terms
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- composite volcano
- tall, cone shaped mountains in which layers of lava alternate with layers of ash
- Caldera
- a huge hole left by the collapse of a volcanic mountain
- Shield Volcano
- Lava flows gradually build a wide, gently sloping mountain
- Lava Plateaus
- some eruptions form high level areas, with thin runny lava that travels far before cooling and solidifying.
- Composite Eruptions
- Quiet eruptions rotate with explosive eruptions
- volcanic neck
- forms when magma hardens in a volcano's pipe
- Cinder Cone Eruptions
- Erupt Explosively
- What do volcanic eruptions create
- landforms made of lava, ash and other materials
- dike
- magma that forces itself across rock layers
- How does a caldera form
- when the magma chamber is empty the mountain becomes a hollow shell. With nothing to support it, the mountain collapses inward
- cinder cone
- a steep, cone-shaped hill or small mountain
- sill
- forms, when magma squeezes between horrizontal layers of rock
- Shield eruptions
- Quiet eruption
- Volcanic Activity formed
- the rock of the ocean floor
- inside a caldera
- filled with pieces of the volcano that have fallen inwards, as well as some lava and ash
- Soils from Lava and Ash
- when volcanic ash breaks down it realeases substances that plants need. some volcanic soils are among the richest soils in the world