Boiling Mud Pots In New Zealand Geothermal Activty

te puia new zealand rotorua bubbling mud pot boiling hot heat earth crust geothermal activity feature maori sulfurous mud brown smelly rotten eggs smell stench thick goopy liquid volcanic ash splatter plopping crater ground vent steam bubbly gases active cauldron hydrogen sulphide mud pool acid clay farting gas releasing gooey thermal features whakarewarewa dry wet