hikers stand at the edge of an active volcano as lava cascades into the ocean under a stormy sky

39aph39 active activity adventure ash boiling breathtaking cascades cliff clouds coastline cracked crater danger dark dramatic earth edge entering entry environment erupting eruption exploding exploration explosive extreme fire flow flowing fumes gas geology geothermal glow glowing heat hikers hiking hill illuminated landscape lava molten mountain natural nature object observe ocean outdoors phenomenon plain power red rock rugged s scenery scenic science sight sky smog stand stormy strength temperature terrain travel two volcanic volcano wilderness