The process in which eroded pieces of rock are left in a new place is called deposition.

Here's how it works:

1. Erosion: Weathering and other forces break down rocks into smaller pieces.

2. Transportation: These smaller pieces are then transported by wind, water, or ice.

3. Deposition: When the transporting force loses energy (like a river slowing down or wind becoming calmer), the eroded pieces are deposited in a new location.

Deposition leads to the formation of various landforms like:

* Sand dunes: Deposited by wind

* Deltas: Deposited by rivers

* Alluvial fans: Deposited by streams at the base of mountains

* Glacial moraines: Deposited by glaciers

So, erosion takes rocks away, while deposition leaves them behind in a new place.