Here's a breakdown of the relevant glacier zones and why your terminology might be incorrect:
* Zone of Accumulation: This is the upper part of the glacier where snow accumulates and is transformed into ice. It is characterized by lower temperatures, more snow, and less melting.
* Zone of Ablation: This is the lower part of the glacier where more ice melts or sublimates (turns directly from ice to vapor) than accumulates. It is characterized by warmer temperatures and less snow.
* Equilibrium Line: This is the line that separates the zone of accumulation from the zone of ablation. It is where the amount of snow accumulation equals the amount of ice ablation.
Where "Fractures" Might Occur:
* Crevasses: These are large cracks in the glacier surface that form due to the stretching and pulling forces caused by the movement of the ice over uneven terrain. They are most common in the zone of ablation where the glacier moves faster and is subject to more stress.
* Bergschrund: This is a deep, often vertical, crevasse that separates the moving glacier from the stationary ice at the top of the glacier. It forms in the zone of accumulation where the glacier ice begins to move downward.
Therefore, the term "zone fracture" likely refers to either crevasses or the bergschrund, but it is not a standard term in glaciology.
It's important to use accurate terminology when discussing glaciers. If you're looking for information about a specific zone within a glacier, be sure to use the correct terms to avoid confusion.
