Can lava melt concrete?

Answer

Concrete is a composite material, so it has no single melting point of its own. Each of the different components of concrete, primarily sand, gravel and cement, has a melting point of its own. Rather than melt concrete, molten lava causes it to rapidly decompose.

According to Oregon State University, lava exists as a liquid between about 1,300 and 2,200 degrees Fahrenheit. At these temperatures, molecules within the concrete called hydroxides decompose into metallic oxides and water. The water quickly escapes as steam, but the oxides can remain solid at very high temperatures. The gravel and other silicates, such as the cement, all have their own individual melting points.

Q&A Related to "Can lava melt concrete?"
almost anything thats solid
http://wiki.answers.com/Q/What+doesnt+lava+melt
The only materials that can resist it are those with melting points above
http://www.chacha.com/question/what-are-some-mater...
"Magma" is a term applied to molten rock, but this is usually a subsurface term. "Molten slurry" might work.
http://answers.yahoo.com/question/index?qid=201101...
Molten metal was present underneath the remains of all three world trade center towers. USGS aerial thermal imaging showed surface temperatures of over 800 degrees F five days after
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