SOLAR SYSTEM

Detailed explanation-1: -The solid metal inner core is the densest layer, the mantle is intermediately dense, and the lithosphere, particularly the continental lithosphere, is the least dense layer.

Detailed explanation-2: -The earth has a very dense inner core made up of heavy metal elements, like iron and nickel, and a much less dense crust (the crust is the layer of earth that we are in direct contact with as this is the layer we live on) that “floats” on top of the dense layers beneath it.

Detailed explanation-3: -Thermosphere. Located between about 80 and 700 kilometers (50 and 440 miles) above Earth’s surface is the thermosphere, whose lowest part contains the ionosphere. In this layer, temperatures increase with altitude due to the very low density of molecules found here. It is both cloud-and water vapor-free.

Detailed explanation-4: -Greenland is the least dense, with around 0.1 people per km², followed by Mongolia, Namibia, Australia, and Iceland.