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chapter 9 lesson 1
chapter 9 lesson 1 volcanoes 6th grade Earth Science
| Question | Answer |
|---|---|
| definition: volcano | a mountain that forms when molten rock, called magma, is forced to the Earth's surface |
| lava flows come from ____________. | non-explosive volcanoes |
| definition: lava | magma that flows onto the Earth's surface |
| what happens in an explosive eruption? | clods of hot debris and gases shoot out from the volcano, and molten rock is blown into the air, it can also demolish rock formations that took years to form |
| basic features that all volcanoes share | they have a magma chamber with vents and magma |
| what the composition of magma depends on | what type of volcano it is non-explosive or explosive |
| high water content | explosively |
| the effect water has on volcanoes is similiar to________________________. | the effect carbon dioxide has on a can of soda |
| how does the explosion work in the can of soda? | when you shake the can up the carbon dioxide that was dissolved is released and since gasses need more room then liquids or solids when you open the can soda comes shooting out |
| silica-rich magama has a______________________. | thick, stiff consitency |
| why does silica-rich magma explode | since it flows slowly it clogs up the vent resulting in a build up in pressure if enough pressure builds up an explosive will happen |
| what does thick magma prevents | water and other gases from easily escaping |
| what does what kink of magma erupts depend on? | the kind of eruption of the volcano |
| what are the two types of magma | pyroclastic and lava materials |
| definition: pyroclastic | consits of rock fragments created by explosive volcanic eruptions |
| explosie eruptions contain ___________ magma | pyroclastic materials |
| nonexplosive eruptions contain __________ magma | lava |
| blocky lava's consistency is | thick making sharp rocks |
| pahoehoe, aa, and pillow lava's consistency is | thin and flows faster |
| when does pyroclastic magma form? | when magma explodes from a volcano and solifieds in the air it also formed when existing rock is shattered by powerful eruptions |
| what are the four types of pyroclastic materials | volcanic blocks, volcanic bombs, lapilli, and volcanic ash |
| volcanic blocks | the largest pieces of pyroclastic material they consist of solid rock blasted out of the volcano |
| volcanic bombs | large blobs ofmagma that harden in the air. the shape of the bomb resulted from the magma's spinning through the air as it cooled. |
| lapilli | means little stones in italian, are pebble like bits of magma that became solid before they hit the ground |
| volcanic ash | forms when the gases in stiff magma expand rapidly and the walls of the gas bubbles explode into tiny glasslike slivers |
| blocky lava | cool, stiff lava that cannot travel far from the erupting vent usually oozes forom the volcano forming heaps of sharp edged chunks |
| pahoehoe | flows slowly like wax ddripping from a candle, forming a glassy surface with rounded wrinkles |
| aa | is a hawaiian word that refers to a type of lava that has a jagged surface, it is slightly stiff, and forms brittle crust, the crust is torn as the lava beneath keeps moving |
| pillow lava | forms when lava erupts underwater it forms rounded lumps that are the size and shape of pillows |
Created by:
gymg8tor
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