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Volcanoes

Lesson 3

QuestionAnswer
Name the 5 landforms formed from lava and ash and describe their shapes. CALDERAS: huge holes, CINDER CONE VOLCANOES: steep, cone shaped-hill, COMPOSITE VOLCANOES: cone-shaped mountain, SHIELD VOLCANOES: wide, gently sloping mountain, LAVA PLATEAUS: large areas of flat land (CCCSL)
What is the term for the huge holes left by the collapse of volcanoes? calderas
Which type of volcano is formed by quiet eruptions of lava alternating with explosive eruptions of ash, cinder, and bombs? composite volcanoes
Suppose lava from a certain volcano has built up a steep, cone-shaped hill around a central vent. What can you conclude about the kind of lava that formed the volcano? a steep cone-shaped hill describes a cinder cone volcano, which has a high silica content. So, you can conclude that the lava is thick and sticky and erupted explosively, producing ash, cinders, and bombs
Hot spot volcanoes that form on the ocean floor are usually what type of volcanoes? shield volcanoes
Identify the 5 landforms created by magma. batholiths, dikes, dome mountains, sills, volcanic necks (BDDSV)
How does a volcanic neck form? a volcanic neck forms when magma hardens in a volcano's pipe and the surrounding rock later wears away
What sequence of 3 events produces a dome mountain? 1) Uplift pushes a large body of hardened magma towards the surface. 2) The hardened magma forces the layers of rock to bend upward into a dome shape. 3) The rock above the dome mountain wears away, leaving it exposed.
Which landform from magma is very large and has an irregular shape? batholiths
How does a lava plateau form? Thin, runny lava flows out of several long cracks and travels far before cooling and hardening. Floods of such lava build on top of other floods. Over millions of years these layers of lava form a plateau.
What happens to create a caldera? A volcanoes eruption empties its main vent and the magma chamber. Without support from below, the top of the mountain collapses inward leaving a huge hold called a caldera.
How do landforms from magma form and become exposed? Magma cools and hardens into rock before reaching the surface.Overtime forces such as flowing water, ice or wind strip away the layers above the hardened magma and expose it.
a mass of rock formed when a large body of magma cools inside the crust batholith
magma that forces itself across rock layers and hardens dike
a landform produced when magma hardens in a volcano's pipe and the surrounding rock later wears away volcanic neck
hardened magma that squeezed between horizontal rock layers sill
the hole left when a volcano collapses caldera
Created by: Isabel Wallwork
 

 



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