1 Prepare before your flight by getting a doctor's letter or note on a prescription pad, stating that you have an implanted metal object. Show this letter to security agents.  Tissue expanders will be overfilled, so your skin can stretch and drape when your permanent breast implant is placed.
If valley glaciers erode a mountain from several directions, a sharpened peak called a horn might form.
There are several erosional features that form as a glacier both scours the rock and pulls pieces away. As rocks are pulled away from valley walls, a steep sided, bowl shaped depression forms at the top of a mountain, called a cirque.The word comes from the French word for circle.lacial Erosion [edit]. The two main ways that glaciers erode the underlying rock are abrasion and plucking. As the thick layer of ice pushes against the underlying rock, it scrapes and polishes the rock surface. As glaciers flow, they scratch the underlying bedrock with all the rocky material they are carrying.