declivity of hill,gradient of slope /SCIENCE,TECH/
[DE] Hangneigung
[EN] declivity of hill; gradient of slope
[FR] déclivité; inclinaison de la pente; pente
angle of slope,gradient of slope /SCIENCE/
[DE] Böschungswinkel
[EN] angle of slope; gradient of slope
[FR] angle d' inclinaison de talus