Gas
The least dense layer will be found on top of the other layers, as less dense materials tend to float on top of denser materials.
The least dense layer of the earth is the Crust , the mantle is second densest , whereas the core is the most dense layer of the earth
Water is less dense than any of the other materials listed.In order of density from least to highest:Water (least dense)GraniteBasaltIron (most dense)
The crust is the least dense portion of the solid Earth because it is the thinnest layer.
No. In fact it is the most dense planet. The least dense is Saturn.
One could say that the atmosphere is the least dense, but of the surface the crust is the least dense.
Helium is the least dense element at normal conditions.
'Least' is a comparison word. Compared to iron and lead yes cotton is least dense. Compares to oxygen gas and hydrogen gas, no it is not least dense.
When heated, gases typically expand and become less dense. So, a gas would be least dense when heated.
Saturn is the least dense planet in our solar system.
The exosphere is the least dense part of the earth's atmosphere.
(most dense to least dense) gold, mercury, water, oxygen