One big pebble.

https://blog.skytruth.org/2010/02/pebble-mine-alaska-superimposed-on.html

Below is a picture of the plans for pebble mine supperimposed on the city of Seattle.    I would use it as    a place based earth science lesson as “hook”.   The class can then discuss what they know about pebble mine and what they think about it.   I would take great care to avoid adding my own personal opinions to the discussion.   As a further note, I would data check this before I presented it.   It is possible the image is an exaggeration.

[SkyTruth_pebble_on_seattle_feb10_after.jpg]

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