Volcanoes volcanology | geology, Kilauea; mount etna; mount yasur; mount nyiragongo nyamuragira; piton de la fournaise; erta ale. http://volcanology.press/Klyuchevskaya_Sopka/Klyuchevskaya_Sopka_knr.php Fundamental interaction, In physics, fundamental interactions, fundamental forces, interactions reducible basic interactions.. http://electromagnetism.gq/fundamentalinteraction/fundamentalinteraction_v.php