Ice needles occur when the temperature of the soil is above 0°C and the surface temperature of the air is below 0°C.
The subterranean water is brought to the surface via small capillaries and then freezes as it goes into needle-like columns a few centimetres long.
http://www.telegraph.co.uk/news/newsvideo/weirdnewsvideo/10024984/Ice-needles-form-on-shores-of-frozen-lake.html
No comments:
Post a Comment