Lava
noun
It can melt a boulder? What is this stuff that's so hot? It's lava. It's also probably made from melted boulders too, come to think of it.
This word uses the on'yomi reading for the kanji, but you haven't learned the on'yomi reading for 岩, which is がん. When you think of lava, think about Gandhi, coming out of the lava. He's immune, because he's a robot.
火山が溶岩を吹き出していて危険なので、これ以上近づくことはできません。
We can’t go any closer because the volcano is spewing out lava and it’s dangerous.