{"version":"1.0","type":"link","title":"Tuff - Newikis","description":"Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption. Following ejection and deposition, the ash lithifies into solid rock. Rock that contains greater than 75% ash is considered tuff, while rock containing 25–75% ash is described as tuffaceous (for example,…","provider_name":"Newikis","provider_url":"https://newikis.com","cache_age":86400,"thumbnail_url":"https://upload.wikimedia.org/wikipedia/commons/c/c5/Guadalupe_Tuff.jpg","thumbnail_width":1280,"thumbnail_height":960}