Volcanic hazards and people
1. One half of the radioactive potassium-40 (K 40 ) in an igneous rock has decayed to argon-40 (Ar 40 ). According to the ESRT, about how many years ago.
ONE OF NATURE’S FACES. Hurricane Earthquake Tornado Volcano Tsunami Flood Drought Hail Forest fire Severe frost Snow storm Thunderstorm.
