Today is #VolcanoThursday #ThrowbackThursday & the 29th February in a #Leapyearπ Exactly 4a ago my humans were on #hedgewatch in the #riftzone (fig 1&2) of #Madeira. It was a pawsome day with great #landscape & #Geology. Fig 3 #spheroidal #weathering & fig4 a #volcanic dyke



