Question: In what year did the eruption occur that laid down the lava upon which a famous forest visible from the Tenjō-Yama Park Mt. Kachi Kachi Ropeway? 
Sentence (from "Tenjō-Yama Park Mt. Kachi Kachi Ropeway"): The Tenjō-Yama Park Mt. Kachi Kachi Ropeway (天上山公園カチカチ山ロープウェイ , Tenjōyama Kōen Kachikachiyama Rōpuwei ) , officially the Lake Kawaguchi Mt. Tenjō Ropeway (河口湖天上山ロープウェイ , Kawaguchiko Tenjōyama Rōpuwei ) , is a Japanese aerial lift line in Fujikawaguchiko, Yamanashi, operated by Fuji Kyuko.
Relevant evidence: Yes