Origins
These entered the Great Lakes via rivers and streams
What are fish?
Three things are required to form a dune: sand, a clear area, and this
What is wind?
The Laurentide was the last one of these to cover the Great Lakes area
What is an ice sheet?
Two categories make up an ecosystem: biotic and this
What is abiotic?
When glaciers melt, they often leave behind this type of large rock
What is an erratic boulder?
This is the first plant to appear on the dunes closest to the water
What is marram grass?
Over time, limestone in the midwest turned into dolostone in part because of the salt from these
What are (ancient) seas?
A scientific term for the process of plant communities giving rise to other plant communities
What is (ecological) succession?
These geologic events created the basins of what would become Lake Superior and Lake Ontario
What are rifts?
The side of a dune opposite to the slip side is called this
What is windward?