"When magma reaches earth's surface it is called lava. It may pour out in gentle streams called lava flows or erupt violently into the air. Rocks ripped loose from the inside of the volcano or torn apart by the gas may be shot into the air with the lava".
-Google
The two types of eruptions are :
Explosive eruptions and effusive eruptions.
Id say Contraction, hope this helps!
Nitrogen is released to the abiotic parts of the biosphere from the process death and by bacteria.
I would say the formation oxygen from water because she is studying and looking for oxidation.
