The reason I do this one first is that you may hit the sides of the. intake flange with the collet, leaving some small gouges in the material â see the second picture below. Doing the. inside cut first allows you to remove any collet gouges in the second cut that opens the runner side.
Composite Volcano. A composite volcano forms in subduction zones when a crustal plate is forced into the mantle and begins to melt. Andesite, dacite and rhyolite lavas are the primary types of lava that form these volcanoes.Eruptions on the volcanoes often alternate between tephra and lava flows. Subduction zone volcanoes.Geologists often use the term stratovolcanoes to describe the mountains that form in subduction zones.he melting oceanic crust forms pools of molten rock in a magma chamber. The magma, molten rock, in the magma chamber is lighter than the volcano rocks that surround it. The magma works its way to the summit where it erupts as tephra or in thick lava flows. Lava eruptions on stratovolcanoes.
Explain that viscosity of lava and magma will vary depending on the temperature and the composition. Explain that the parent material of the magma that forms shield volcanoes is generally basalt, while the parent material of the magma forming composite volcanoes is generally rhyolite (or andesite).6. Write on the board that rhyolite has 69% or more silica, while basalt has about 45-54% silica. Ola Ka Honua: Volcanoes Alive 293 Â©2001, 2007 UAF Geophysical Institute Teacher Instructions Volcano Models7. Using plates B and C, show how âmagmaâ of different viscosities creates different types of volcanoes:a. Poke the mustard bottle through the hole in plate B and squeeze. A large mound should form, representing a composite volcano.b.