Molecular biology is a field of biology that looks at the molecular machinery of life. The field was founded in the early 1930s, though the phrase was only used in 1938 and the field didn't take off until the late 50s and early 60s. Since then, progress in the field has been massive.
The Ionosphere and the Exosphere (minor layers) are parts of the Thermosphere (major layer). The ionosphere is part of the theremosphere.
Earthâs outer layer is the lithosphere, which is a cool, rigid layer that includes the crust and the upper part of the mantle. The lithosphere is divided into pieces called tectonic plates. Below the lithosphere is the asthenosphere, which is a layer of the mantle that is made of very slow-flowing solid rock.elow the asthenosphere is the mesosphere, which is the lower part of the mantle. The mesosphere flows even more slowly than the asthenosphere. Figure 2 The Physical Structure of Earth Earthâs core has two layers. The outer core is a layer of liquid iron and nickel.