good try but the object didn't evaporate and is still at the bottom of the trail... if they take another picture and it's gone then it could very well be, if it's still there, prolly notCO2 dry ice sliding down a hill ?
Nicely done! :-)
good try but the object didn't evaporate and is still at the bottom of the trail... if they take another picture and it's gone then it could very well be, if it's still there, prolly not