Earthquakes, hot springs, fumaroles, mud pots and geysers often accompany volcanic activity. However, there are mud volcanoes and mud geysers elsewhere in Yellowstone. The TVZ also contains numerous smaller volcanoes, along with geysers and geothermal areas. Geological processes include erosion, sedimentation, and volcanic activities such as geysers and earthquakes. The carbon dioxide gas needed for life comes from sources such as volcanoes and geysers. Some volcanic places are also famous tourist destinations, such as the Rotorua geysers. Geothermal power stations can also disrupt the natural cycles of geysers. The peculiar way of eruptions is an important feature of these geysers. Half of the world's geysers and hydrothermal features are concentrated in Yellowstone. The most developed geothermal field is the Geysers in California. New geysers and cracks sprouted up in nearby Yellowstone National Park. Processes have evolved in the sea near geysers of hot mineral water. His stories about the geysers at Yellowstone, for example, proved to be true. Small, widespread, temporary geysers produce cones of salt. In some places, they are called "multipoint heaters", "geysers" or "ascots".