Posted in Social Science

Which Two Layers Make Up The Thermosphere

The thermosphere is the part of atmosphere that lies beyond mesosphere. It can be divided into two layers i.e. the ionosphere and the exosphere. The ionosphere is the lower part of the thermosphere. It lies beyond the mesopause. It extends from 80 to 640 km. Temperature rises sharply here. The ultraviolet radiation {UV rays} break the gas molecules here into electrically charged ions. Therefore the ionosphere is full of electrically charged ions which enable wireless transmissions. The upper limit of the ionosphere is ionopause. The exosphere lies beyond the ionopause and is the uppermost layer of the thermosphere. The upper limit of the exosphere is difficult to determine as…

Posted in Social Science

Types of Rocks and Explain the Formation of Each with Examples

The major types of rocks are igneous rocks, sedimentary rocks and metamorphic rocks. let’s know more about these types of rocks in ensuing paragraphs. Igneous Rocks The hot lava that flows out of a volcanic eruption cools down, solidifies over a period of time and forms igneous rocks. The word igneous is derived from the Latin word ignis- which means ‘fire’. Igneous rocks are also called primary rocks. Basalt is an example. Sedimentary Rocks Over a period of several years, sediments carried by agents of gradation like water, ice, wind and the sea are deposited in layers over the earth. The sediments may consist of weathered…

Posted in Social Science

Layers of Earth Illustrated with Suitable Diagrams

There are basically three layers of earth, namely; crust, mantle and core. These are explained further below: (a) Crust The crust is the uppermost layer of the earth. It is the thinnest among the three layers, forming just 1% of the earth’s volume. The crust is made up of two layers. The upper layer forms continents. It consists of the minerals silica and aluminum, therefore is called Sial. The lower crust is the continuous layer of denser rocks forming the floor of the oceans. It is made of minerals silica and magnesium and is therefore called Sima. The crust varies thickness from around 5-7 km under the under…