Screen shot of a glacier from the file that shows dramatic changes over the seasons
The placemarks in 'Show Elevation Profile' folder need you to right click the placemark in the places column then select 'show elevation profile' to turn it on.
The other placemarks are related to time. Follow these steps:
1] turn on historical imagery on the top bar in Google Earth by clicking the clock with arrow icon.
2] double click the yellow pins to be flown to the place in space and 'flown back in time
With Katama Bay, this illustrates long shore drift and I've left you to play with the historical imagery time slider ( above) as you wish.