Question

The picture below shows a model of a water geyser like those in Yellowstone National Park, which erupt with giant plumes of hot water.



Which process drives geyser eruption?

a
the condensation of water that collects underground
b
the conduction of thermal energy from the ground
c
the convection of water above the hot magma in the mantle
d
the radiation of the Sun's energy into the ground water

Answer 1

c

Geysers erupt because groundwater is heated by hot rock/magma; the heated water becomes buoyant and moves upward (convection), and in constricted channels flashes to steam causing an eruption.