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This ice waterfall shows some illumination on the bottom (somebody was shining a flashlight) and some of the red lava (or earth) above. The lavender is some sort of artifact of technique because I recall no colors like that in the cave - but it looks nice in the picture.
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Dendritic ice crystals imaged with a scanning electron microscope. The colors are computer generated. The aerospace industry is working to design a radar that can detect ice crystal environments to discern hazardous flight conditions. Ice crystals can melt when they touch the surface of warm aircraft, and refreeze due to environmental conditions.
Water vapor plays a role as it deposits ice crystals, known as hoar frost, during cold, still conditions. [54] During this transition, snow "is a highly porous, sintered material made up of a continuous ice structure and a continuously connected pore space, forming together the snow microstructure".
Halos - appear with ice clouds. Crystals have to be small 15 or 20 microns. The 'rainbows' thrown by lead crystals are more similar to sundogs then rainbows and are more. Sun dogs are generated when light interacts with hexagonal plate like ice crystals that are approximately 30 microns in size and fall horizontally.
A snowflake is a single ice crystal that is large enough to fall through the Earth's atmosphere as snow. [1] [2] [3] Snow appears white in color despite being made of clear ice. This is because the many small crystal facets of the snowflakes scatter the sunlight between them. [4]
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A light pillar or ice pillar is an atmospheric optical phenomenon in which a vertical beam of light appears to extend above and/or below a light source. The effect is created by the reflection of light from tiny ice crystals that are suspended in the atmosphere or that comprise high-altitude clouds (e.g. cirrostratus or cirrus clouds). [1]