1. What were the main landscape features that suggested glacial origin?
2. What were the landscape features that were inconsistent with glacial formation?
3. What was the one feature that Bretz walked over many times that ultimately helped
him come up with his theory of how the scablands formed?
4. Why are scientists in Iceland so interested in glacial movement and in what happened in
Washington 10,000 years ago?
5. The giant potholes in the landscape were one of the last features to be explained by
people studying the region - what is the current best understanding of how they were
formed?
6. We often think of endogenous forces (erosional forces) as being slow and steady over
time – brainstorm at least two "slow and steady" erosional processes and at least two
"catastrophic" erosional processes that can affect landscape: