BBC2 年
Types of volcano - composite and shield
A lava tube may also form, beneath the surface of the ground, when low viscosity lava develops a hard crust through which lava flows.
Newsable Asianet News on MSN7 个月
Volcano Varieties: 7 types of Volcanic mountains in the World
these volcanoes form from low-viscosity lava that can travel great distances. Notable examples include Mauna Loa These ...