Final answer:
A morning crust layer on the snowpack is typically found on polar caps and glacial surfaces, where freeze-thaw cycles create a crust from refreezing melted snow. Varve layers signify seasonal changes that can lead to crust formation. This phenomenon is observed on Earth and suggested on Mars through orbital imaging.
Step-by-step explanation:
A morning crust layer on the snowpack is likely to be found on surfaces with significant temperature variations and where moisture is present. In the geography of polar regions, this can be observed where snow undergoes a freeze-thaw cycle, creating a crust when the surface refreezes after thawing during the day. Two aspects where one would find such a layer are on polar caps and glacial surfaces, which both exhibit the necessary environmental conditions for crust formation.
Varve layers, which are paired light and dark sedimentary layers, can also indicate cyclical seasons of high and low deposition that could contribute to crust formation. The Colorado Rockies snowpack, as impacted by dust from the Colorado Plateau, is another instance where a crust might develop due to changes in albedo and subsequent melting and refreezing. The application of these principles is not just limited to Earth; on Mars, orbital images show evidence of layered deposits and ice beneath the surface dust, suggesting similar processes might occur in Martian poles, contributing to the understanding of seasonal changes and the potential for water ice on the red planet.