Country: United States
What is the temperature of the lava when it
erupts from a volcano?
The temperature of the lava can range from about 700 C to about
1600 C. How hot it is depends upon how deep the magma (melted rock
inside the earth, before a volcanic eruption) comes from, how fast
the volcano erupts (if it erupts over many days/weeks the magma
will cool before the eruption), and many other factors such as its
gas content, viscosity, composition -- it's a long list. You can
find a lot of info by doing a "Google" search on the term:
"volcanic lava temperature". This will also lead you to other
sites, including some with spectacular photos.
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Update: June 2012