section 13-1 review
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Section 13-1 Review. Page #324:1-8. #1. Describe three conditions that affect whether magma forms. Magma forms when. the temperature of the rock rises above the melting point of the minerals that compose it,. the pressure of the rock decreases faster than its temperature does,. - PowerPoint PPT PresentationTRANSCRIPT
#1#1Describe three conditions that affect Describe three conditions that affect
whether magma forms.whether magma forms.
Magma forms when . . . Magma forms when . . . • the temperature of the rock rises above the the temperature of the rock rises above the
melting point of the minerals that compose it, melting point of the minerals that compose it,
• the pressure of the rock decreases faster than its the pressure of the rock decreases faster than its temperature does, temperature does,
• when it is mixed with fluids that decrease its when it is mixed with fluids that decrease its melting point.melting point.
#2#2
Explain how magma reaches Explain how magma reaches Earth’s surface.Earth’s surface.
Magma reaches Earth’s surface Magma reaches Earth’s surface because the rising magma is less because the rising magma is less dense than the surrounding rock of dense than the surrounding rock of the crust.the crust.
#3#3
Compare magma with lava.Compare magma with lava.
Magma is melted rock beneath Earth’s Magma is melted rock beneath Earth’s surface; lava is magma that erupts surface; lava is magma that erupts onto Earth’s surfaceonto Earth’s surface
#4#4
Describe how subduction produces Describe how subduction produces magma.magma.
The denser, subducted plate releases The denser, subducted plate releases fluids to the surrounding crust and fluids to the surrounding crust and mantle materials, thus lowering their mantle materials, thus lowering their melting points and causing magma melting points and causing magma to form.to form.
#5#5
Identify three tectonic settings Identify three tectonic settings
where volcanoes commonly where volcanoes commonly
occur.occur.
subduction zonessubduction zones
mid-ocean ridgesmid-ocean ridges
hot spotshot spots
#6#6
Summarize the formation of hot Summarize the formation of hot
spots.spots.
The hot spot lies above a column of The hot spot lies above a column of solid, hot material from the mantle. solid, hot material from the mantle. When the mantle material spreads When the mantle material spreads out at the top of the plume, its out at the top of the plume, its pressure drops and the rock melts. pressure drops and the rock melts. The resulting magma forms The resulting magma forms volcanoes at the hot spot.volcanoes at the hot spot.
#7#7
Describe how the presence of ocean water in Describe how the presence of ocean water in crustal rocks might affect formation of crustal rocks might affect formation of magmamagma ..
Ocean water in ocean rock can lower Ocean water in ocean rock can lower the melting point of the rock and aid the melting point of the rock and aid the formation of magma. the formation of magma.
#8#8Yellowstone National Park in Yellowstone National Park in Wyoming is far from any plate boundary. Wyoming is far from any plate boundary. How would you explain the volcanic How would you explain the volcanic activity in the park?activity in the park?
The volcanic activity in Yellowstone The volcanic activity in Yellowstone National Park would be due to mantle National Park would be due to mantle plume that cause a hot spot within plume that cause a hot spot within the continental crust.the continental crust.