Which of the following is an ice formation?

• A. Water level
• B. Thermal Crack
• C. Slush
• D. Border

Answer: (B)

Recognizing ice formations means spotting features that are part of the ice itself, not just conditions or other materials on the surface. A thermal crack is a fracture formed in ice because of temperature changes; as ice expands and contracts with warming and cooling, it can develop visible cracks that become a structural feature of the ice. This makes it a true ice formation you’d assess for safety. The other options aren’t ice formations: water level is simply how high liquid water sits, not a feature of the ice; slush is a mix of ice and water—more a condition than a distinct ice structure; a border has no relation to ice formation.