Movement of earth material as a unit along a curved surface is called?

Movement of earth material as a unit along a curved surface is called?

خمیدہ سطح کے ساتھ ایک اکائی کے طور پر زمینی مواد کی حرکت کو کیا کہتے ہیں؟
Explanation

Slumps are different from flows because, although the material under the slump may act like a liquid, the actual material that slides downhill stays solid.