ローム層[roomusou] stratum of loam
亜成層圏[aseisouken] substratosphere
一層[issou] much more
沖積層[chuusekisou] alluvium
下層[kasou] lower strata (classes)

下層階級[kasoukaikyuu] proletariat
下層社会[kasoushakai] the underworld
下層土[kasoudo] subsoil
化石層[kasekisou] fossil bed
階層[kaisou] class

懸崖[kengai] overhanging cliff
断崖[dangai] palisade
海食崖[kaishokugai] sea cliff
崖崩れ[gakekuzure] landslide
崎崖[kigai] steepness of a mountain

断崖絶壁[dangaizeppeki] precipitous cliff
崖道[gakemichi] path along a cliff
崖っぷち[gakeppuchi] edge (e.g. of a cliff, precipice)
断層崖[dansougai] fault scarp

断トツ[dantotsu] the best
一刀両断[ittouryoudan] cutting in two with a single stroke
引っ張り剪断強度[hipparisendankyoudo] peel strength (conductor from substrate)
英断[eidan] resolution
横断[oudan] crossing

横断歩道[oudanhodou] pedestrian crossing
果断[kadan] decisive
間断[kandan] break in time
強制中断[kyouseichuudan] forcing to a stop
禁断[kindan] prohibition