Final answer:
Half of the world's geysers are found in Yellowstone National Park, fueled by geothermal heating from geological activity. These geysers are part of the broader 'ring of fire' and contribute to sustainable energy sources like geothermal electricity production.
Step-by-step explanation:
Approximately 1/2 of 1000 geysers on Earth are found in Yellowstone National Park. This high concentration of geysers can be attributed to the underlying geothermal activity which includes hot springs like the Grand Prismatic Spring. Yellowstone's geysers, such as Old Faithful, are fueled by water heated by magma, which then erupts through the ground when it reaches boiling point due to a decrease in pressure. The heat necessary for these reactions comes from the Earth's interior, where radioactive decay plays a role in continually replenishing this geothermal heat.
The presence of geysers is often associated with volcanic areas located along the "ring of fire", particularly at tectonic plate boundaries where volcanic activity is common. As a source of energy, geothermal sources such as geysers offer a more sustainable alternative compared to fossil fuels, and significant geothermal energy is produced in places like California and Iceland.