In terms of high altitude landscapes, what are penitentes?

Question

What is a method of preserving and sterilising food, in which a product is processed under very high pressure, leading to the inactivation of certain microorganisms and enzymes in it?

Answer 1

Groups of elongated, thin blades of hardened snow or ice
Penitentes formations are closely spaced and point towards the general direction of the sun. Causes are complex, including the original nature of the uppermost snow cover, dust, changes of physical conditions acting on the snow, changes in the internal fabric of the snow.