rock that in its molten form (as magma) issues from volcanos; lava is what magma is called when it reaches the surface
- The molten lava ran down the mountain.
- That volcano cast forth lots of lava and ashes.
- Lava could account for the mare infill on the Moon.
- Back in the smelting, pull the lever to open the lava pit.
If the magma is erupted at the surface as lava, it forms extrusive igneous rocks such as basalt.出自：Scientific American
- ash 灰