Liquids. The liquid matter is the lava. The temperature of freshly ejected lava may range between (600 to 1200) Celsius. Water also comes out along with lava. The speed of lava flow depends upon its composition, mobility and the slope of the ground. Usually the movements is very slow and even a speed of 15 km per hour is rarely achieved. But sometimes the speed may be as high as 80 km per hour.