#40YearsAgo at #MountStHelens: After 123 years asleep, Mount St. Helens stirs. A sharp increase in #earthquakes with 5 larger than M3.0 and one larger than M4.0; bad batteries at field instruments mean no recorded data at some stations. #MSH40
The breaking up of GondwanaโPrecambrian terranes(pink); mid-ocean ridge growth(red); mantle plumes (yellow stars), creation of large igneous provinces (blue/orange) & transforms/fracture zones(pale blue)
https://t.co/9N3Mf5WIfB
#EarthScience#geology#maps
It's #PolarBearDay! Celebrate by making a symbolic polar bear adoption today. All donations go toward making our oceans safer for polar bears and other marine life.