Exit temperatures—the temperature of lava as it comes from the mouth, or crater, of volcanoes—indicate that lava’s heat varies.
The temperature ranges from 700 to 1,200° Celsius (1,300 to 2,200° Fahrenheit). At its hottest, lava is about 10 times the temperature of boiling water.
It also ranges in viscosity, or how thick or runny it is. Lava can be very thin and fluid, or it can be so thick that it almost doesn’t flow.
The estimated daily lava production of Mauna Loa plus Kiluaea, 2 large volcanoes in Hawaii, would fill 65,000 cement trucks.