called alkaline lava, has an extremely low viscosity, making it almost as fluid as water. Alkaline lava has a melting temperature in excess of 2,000 degrees Fahrenheit. The fluidity and extreme ...

A lava tube may also form, beneath the surface of the ground, when low viscosity lava develops a hard crust through which lava flows.

Lava with less silica in it has lower viscosity, meaning it is less thick and oozy than you've come to expect of lava. As a result, it flows much faster than other lavas, and cools as it does so ...

A volcano near Anchorage, Alaska, called Mount Spurr, has been rumbling. As a result, the U.S. Geological Survey and Alaska Volcano Observatory issued an alert. This indicates that the volcano, which ...