Where was this photo taken most likely?
The Dead Sea is one of the world's saltiest lakes. Its water has a density of 1.240 kg/l, which makes swimming similar to floating. For comparison, fresh water has 1.0 kg/l and average seawater has 1.025 kg/l.
Answers by country
the United States
the United Kingdom
What kind of ships have typically the longest lifespan?
Ocean passenger ships
Great Lakes freighters
In moderate and cold climates, a tree gains one ring every year, which allows us to estimate its age. Where else we can estimate age in similar fashion?
on the beach, layers of sand and grit
at the bottom of the lake, sedimentation
in the craters, pyroclastic rocks
in the glaciers, layers of clay and sand