What causes the scratching of bedrock in glacial abrasion?

💡 The Answer

• Natural scratching of bedrock is caused by continuous snow or glacier movement downhill.
• Force, friction, and vibration from ice movement scratch the bedrock.
• Internal deformation of the ice contributes to scratching.
• Sliding over rocks and sediments at the glacier base scratches surfaces.
• This process slowly grinds down bedrock over time.