How is it captured

Geothermal systems can be found in regions with a normal or slightly above normal geothermal gradient (gradual change in temperature is known as the geothermal gradient, which expresses the increase in temperature with depth in the earth’s crust. The average geothermal gradient is about 2.5-3 °C/100 m.) and especially in regions around plate margins where the geothermal gradients may be significantly higher than the average value.

The most common current way of capturing the energy from geothermal sources is to tap into naturally occurring

“hydrothermal convection” systems where cooler water seeps into the earth’s crust, is heated up and then rises to the surface. When heated water is forced to the surface, it is a relatively easy to capture that steam and use it to drive electric generators.