Here's how it works:

* Erosion: Cirque erosion is primarily caused by freeze-thaw weathering and glacial abrasion.

* Freeze-thaw weathering: Water seeps into cracks in the rock, freezes, expands, and wedges the rock apart. This process widens and deepens existing cracks, creating a bowl-shaped depression.

* Glacial abrasion: As glaciers move down a mountainside, they scrape and grind against the rock, further deepening and shaping the cirque.

Deposition is not a significant factor in cirque formation. However, the eroded material from the cirque might be deposited elsewhere by the glacier as it flows, contributing to the formation of other glacial features like moraines or outwash plains.

In summary:

* Cirque erosion: Creates bowl-shaped depressions in the mountains.

* Cirque deposition: Not a primary factor, but eroded material from the cirque can be deposited elsewhere by the glacier.