In its upper course where the river channel is narrow, the river erodes downwards through the processes of hydraulic action, abrasion, attrition and solution., This downward erosion creates steep valley sides. Over time, rainwater and gravity transport soil and stones down the valley sides towards the river., As more debris from the valley sides is washed downhill, the valley eventually becomes V-shaped..

Bestenliste

Visueller Stil

Einstellungen

Vorlage ändern

)
Soll die automatisch gespeicherte Aktivität wiederhergestellt werden?