007 - squating by a basalt 013 - sitting on a concretion 018 - learning about poison ivy 025 - hiking to the bog 027 - listening intently 032 - standing on the esker 038 - collecting bog water for testing 039 - more bog water collection 040 - one more sample of bog water 042 - putting geologic time in order 043 - determining the order of events 045 - origin of the earth 046 - walking back in time 048 - when did all of these events occur 053 - leaping back in time