Which is an ice formation?

• A. Thermal Crack
• B. Pressure ridge
• C. Wind
• D. Water level

Answer: (B)

This item focuses on recognizing ice formations on frozen water. A pressure ridge forms when moving ice floes collide and compress, pushing the ice up into raised ridges along the surface. These elevated features indicate deformation from stress in the ice as it thickens and buckles. Thermal cracks are cracks caused by temperature changes, not raised surfaces. Wind can move and shape ice, but the specific formation produced by compression of ice is a pressure ridge. Water level isn’t a surface ice feature; it relates to depth or stage of freezing rather than a formation.