The similarity between the dead sea and the Caspian sea is the fact that both seas are known to have high salt content.
This is a term that is used to refer to those water bodies that are known to contain a great amount of sodium chloride.
By sodium chloride what is meant here is that the two seas have a lot of salt content in them.
Read more on salinity here:
https://brainly.com/question/20283396
