Fulgurite

{
  "id": "MLC-T-MET-005848",
  "term": "Fulgurite",
  "field": "Meteorology and atmospheric science",
  "definition": "A hollow, glassy tube or crust formed when lightning strikes sand or soil, instantly melting and fusing the material. These natural formations are typically irregular in shape and can extend several meters into the ground, preserving the path of the lightning discharge. Their presence indicates past lightning activity in an area.",
  "url": "https://mlchart.com/terminology/meteorology/fulgurite/"
}