74 Igmeouss Rocks Vilmene rexis ane moks that have on wallind frum lass - Fiyen 45 - d tieler cuer uat a compenelte velcanu C4.1s Buanew ia the arrial phesograph in ficure 4.8 . Hy if the erater ham been bexacbet ly a marrew dark. Moumt St. Melens, Wrashington Aerial photo made bofore 1900 eruption Igneous Rocks it ile iruter has bere breached by a Mount St. Helens, Washington Aerial photo made before 1960 eruption .