Changes

[[Image:Tree_mold.jpg|thumb|300px|A tree mold glows several hours after pahoehoe lava surrounded a tree and burned its trunk until the tree fell onto the lava flow; the trunk is visible in upper right. The glow is from the hot lava below.]]Fluid basaltic [[lava]] may preserve the shapes of trees and other objects by solidifying around them. '''Tree molds''' are formed when lava surrounds a tree, chills against it, and then drains away. The standing structure left behind is often called a '''lava tree'''.

[[Image:Tree_mold.jpg|thumb|300px|A tree mold glows several hours after pahoehoe lava surrounded a tree and burned its trunk until the tree fell onto the lava flow; the trunk is visible in upper right. The glow is from the hot lava below.]]Fluid basaltic [[lava]] may preserve the shapes of trees and other objects by solidifying around them. '''Tree molds''' are formed when lava surrounds a tree, chills against it, and then drains away. The standing structure left behind is often called a '''lava tree'''.

Tree trunks engulfed and incinerated by lava leave cylindrical hollows, or tree molds, where lava solidified against them; tree molds often preserve the original surface texture of the tree. Tree molds are found within standing lava trees and on the surfaces of lava flows. They are common in [[pahoehoe]] flows and occasionally found in [[`a`a]] flows.<ref>http://volcanoes.usgs.gov/Products/Pglossary/treemold.html</ref>

Tree trunks engulfed and incinerated by lava leave cylindrical hollows, or tree molds, where lava solidified against them; tree molds often preserve the original surface texture of the tree. Tree molds are found within standing lava trees and on the surfaces of lava flows. They are common in [[pahoehoe]] flows and occasionally found in [[`a`a]] flows.<ref>[http://volcanoes.usgs.gov/Products/Pglossary/treemold.html U.S.G.S. Glossary of terms]</ref>

==References==

==References==

[[Category:Geology]]

[[Category:Geology]]