URL：https://images2.minutemediacdn.com/image/upload/c_fill,w_1440,ar_16:9,f_auto,q_auto,g_auto/shape/cover/sport/52187-gettyimages-642611368-d9692104113cb012320993c0a16dfa37.jpg
掲載元：https://jacyou.com/society/hatsumi/article/52187/what-causes-sinkholes
