The thermosphere is divided into ionosphere and exosphere
The thermosphere consists of two layers: the lower layer, called the mesosphere, extends from about 50-85 kilometers above the Earth's surface. The upper layer, known as the thermosphere, starts around 85 kilometers and extends to about 600 kilometers. These layers experience extreme temperatures, are where the auroras occur, and are important for satellite communication and navigation.
The skin is the organ that has two layers, the epidermis and the dermis. The epidermis is the outermost layer responsible for providing a waterproof barrier and the dermis is the layer beneath it that contains blood vessels and nerve endings.
The body of a sponge is made up of two main cell layers: the outer protective layer called the pinacoderm and the inner digestive layer called the choanoderm. These layers are separated by a jelly-like substance called mesohyl, which contains other cell types.
Generally is 2 layer in a Dual layer DVD.
There are 4 layers the rainforest:EmergentCanopyUnder-canopyShrub layer
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 ozone layer lies in the stratosphere. It does not lie between 2 layers. Some ozone is there in troposphere.
The three primary germ layers in the gastrula are the ectoderm (outer layer), mesoderm (middle layer), and endoderm (inner layer). Each layer gives rise to different tissues and organs in the developing embryo.
The Stratosphere has two layers the normal stratosphere and the ozone layer. The Thermosphere also has two layers the normal thermosphere and the ionosphere.
4 layers are present in ATM reference modal 1.physical layer 2.ATM layer 3. ATM adaptation layer 4. higher layer
6 layers 1- molecular layer 10% 2-external granular layer 10% 3-external pyramidal layer 30% 4-internal granular layer 10% 5-internal pyramidal layer 20% 6-multiform layer 20%
Because it was developed that way. Nowadays, layer 2 is sometimes divided into 2 "sub-layers", and the MPLS protocol is considered to be between the layers 2 and 3, and is therefore sometimes called "layer 2.5", but the traditional 7 layers are usually maintained as the "official" layers. We might say this is for historical reasons.