The answer is:
Magma
Groundwater
The explanation:
The magma must interacting beneath the surface as the gesyer erupting forms when a surface water go under ground to deep depth and there is a magma in the benenth of the surface , and then the water will meet the hot rocks under the ground and this will make the water be very hot near to 100 degree c but not boiled and start to erupted from the weak layers to the surface form the gesyer erupting.
