Despite its northern location, with low temperatures and thus reduced chemical activity, there are numerous big caves in Alaska. The reason are the high precipitation and the acidic soils of the typical west coast rain forests. Wherever soluble rock like limestone and marble occurs, intense karstification is found too. The most impressive karst areas are located in southeast Alaska, especially in Tongass National Forest on Prince of Wales Island. El Cap Pit is at the moment the deepest single drop pit in the USA.

More famous are the natural resources of Alaska, especially the gold which caused the world famous gold rush. But there is also oil and other resources. Some of the mines are open to the public.