3 sentences

1. 火山喷发出灼热的岩浆。

   huǒ​shān pēn​fā chū zhuó​rè de yán​jiāng.

   The volcano erupted, spewing scorching magma.

   Source: Dong Chinese Dictionary

2. 岩浆从山侧的裂口处喷涌而出。

   yán​jiāng cóng shān cè de liè​kǒu chù pēn​yǒng ér chū.

   Magma spewed out from the fissure on the side of the mountain.

   Source: Dong Chinese Dictionary

3. 熔化的岩浆冷却后会凝固成岩石。

   róng​huà de yán​jiāng lěng​què hòu huì níng​gù chéng yán​shí.

   Molten magma solidifies into rock after cooling down.

   Source: Dong Chinese Dictionary