Find a term from the labs, understand the process behind it, and see how it appears in the landscape. Each entry connects an explanation with a real observation and a model you can explore.
Term
Stack
An isolated pillar of coastal rock left by erosion and cliff retreat, sometimes after the collapse of a sea arch. Old Harry is chalk; Durdle Door is an arch in limestone.
What to look for
Hvítserkur, Iceland. This isolated coastal rock illustrates a stack, with openings cut through its base.
