'Cause they ARE made of different things
differentiation
The Earth's inner core and outer crust are both solid layers that do not flow. The inner core is solid due to immense pressure, while the crust is made up of solid rock.
A hydra typically has two cell layers: an outer layer of epithelial cells and an inner layer of gastrodermal cells. These layers are separated by a jelly-like extracellular matrix called the mesoglea.
2 layers of cells: an outer layer for protection, inner layer that is the lining of the stomach. between these 2 layers is a jelly like material, called mesogloea.
The primary material in most North Face jackets is the nylon outer layer. The inner layers of the jackets contain down material that is meant to insulate the body.
A Poriferan typically consists of two cell layers: the outer epidermis and the inner layer of cells called choanocytes. These cells are separated by a gel-like matrix called mesohyl.
The amount of pressure overcomes the material's disposition to melting at high temperature. It solidifies.
20198932174012927903 layers
Mantle , outer and inner core .
Yes, the nuclear membrane consists of two layers, just like the plasma membrane.
The phylum Cnidaria has two layers of tissue: the outer epidermis and the inner gastrodermis separated by a jelly-like mesoglea layer. This simple body plan is characteristic of organisms like jellyfish and sea anemones.
Earth's inner core is Earth's innermost part and is a primarily solid ball with a radius of ... The fact that precious metals and other heavy elements are so much more ... that the solid inner core itself is composed of layers, separated by a transition.