Lava is molten or liquid rock that is expelled from earth's center.
Lava is a noun.
The approximate temperature of Lava discharged in the Mt. St. Helens eruption was 2000 degrees Fahrenheit.
The Mantle is the second outermost layer of Earth, between the core and the crust, and is approximately 1800 miles thick.
Mantle is a noun.
The Mantle, despite popluar belief, is composed of mostly solid rock, and is between 300 and 4500 degrees Celcius depending on close to or far away you are from the inner core.