The mixing of something hot and something cold can produce results such as this photograph illustrates: a fire that has been lit on ice, and has melted it’s way down through the ice. If it keeps going, it will end up in water…
Taken atop an observation/look-out tower within walking distance from home, the picture shows the lichens growing on exposed wood.
This is the same tree as I have photographed earlier: https://fotoblogg.wordpress.com/2007/12/22/203/
And, again, the picture is in full colour despite not looking like it.