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Pillow basalt forms when lava erupts deep underwater. At a great enough depth there is enough pressure to prevent a steam explosion, so instead the water rapidly cools the surface of the lava, forming a solid crust around it. eventually the lava breaks though this crust only to have its surface cooled again, and the cycle repeats
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What are the three types of lava flows associated with basaltic lava?
basaltic lava can form a'a, pahoehoe, or pillow lava.
How does pillow basalt form?
Pillow basalt is formed when lava extrudes from the ocean floor - perhaps into a sediment overburden (?) - such that each bolus of lava is separate from the others.
What type of lava that erupts underwater and takes the form of round lumps?
Lava that erupts underwater and takes the form of round lumps is called pillow lava
What type of lava erupts underwater and takes the form of round lumps?
it is called pillow
How are Pillow Lava and Pahoehoe lava the same?
Both pillow lava and pahoehoe lava have about the same composition and harden into a kind of rock called basalt.
How can pillow-shaped bodies form from lava?
as they cool
Describe pillow lava?
Because it solidifies outside the surface of the earth, it is an extrusive igneous rock.
Type of lava that erupts underwater and takes the form of round lumps?
Pillow lava
What are the three types of lava flows associated with basaltic lava?
basaltic lava can form a'a, pahoehoe, or pillow lava.
How does pillow basalt form?
Pillow basalt is formed when lava extrudes from the ocean floor - perhaps into a sediment overburden (?) - such that each bolus of lava is separate from the others.
What type of lava that erupts underwater and takes the form of round lumps?
Lava that erupts underwater and takes the form of round lumps is called pillow lava
How hot is pillow lava?
pillow lava is 2500 degrees
What is the the lava that flows slowly to form a glassy surface with rounded wrinkles?
Pahoehoe or pillow lava - same thing
What type of lava erupts underwater and takes the form of round lumps?
it is called pillow
How are Pillow Lava and Pahoehoe lava the same?
Both pillow lava and pahoehoe lava have about the same composition and harden into a kind of rock called basalt.
Does pillow lava have high silica?
No. Pillow lava is basaltic, so it has a low silica content.
How does rising magma and flowing lava create underwater pillow lava?
Because the magma is erupted into the cold water, the outside of the flow quickly cools and solidifies into a hard shell which causes the backside flow to seek a new, less resistant pathway. When the flow is pinched off before re-routing, a bulbous pillow shaped, rapidly cooling blob is formed. Most of the ocean floor laying under layers of sediment and sedimentary rock, is formed from masses of pillow lavas (basalt).
