earth crust mantle and core

The mantle is a thick layer of rock below the crust. It is the central region between the crust and the core of the earth. It is about 2,900 km deep. The rock in the mantle is made of silicon, oxygen, aluminium, iron and magnesium. The upp..

Continents and ocean basins (land beneath the oceans) are part of a rocky 'skin' that surrounds the main body of the earth. This skin is called the earth's crust. The crust of the earth is like the skin around an orange or an apple. The thickness of..

Structure of the Earth - In outward appearance, the earth is a nearly spherical ball with a radius of 6350 kilometers. Internally, the earth consists of three major layers. They are: Crust Mantle Core..

. The earth's earliest atmosphere may have contained hydrogen, helium, methane and ammonia, similar to the present atmosphere of Jupiter. Or it may have contained a large amount of carbon dioxide, as does the atmosphere of Venus. The earth's earliest atmosphere probably did not ..

Earth is the only planet in our solar system, which is surrounded by oxygen, the life giving gas. It is the only planet to have large quantities of water. Earth's atmosphere contains oxygen, nitrogen, carbon dioxide and water vapour. Earth Earth is a medium s..

Structure of the Earth - During the formation of the Earth, cooling of gaseous mixtures took place and molten earth condensed to form different earth zones or layers. Each layer that formed on top of the other had a definite chemical composition and thus a di..

Earth as a Source of Elements - Most elements are formed due to fusion of simple nuclei to give heavier nuclei i.e., nucleosynthesis or nuclear fusion reactions taking place in the stars. Atoms of these elements began to fall together about six billion years ago to form a system, presentl..

Rocks are polycrystalline solid portions of the earth's crust having a definite texture and mineral content. Usually two or more minerals combine to form different rocks. They are classified ..

Rocks are polycrystalline solid portions of the earth's crust having a definite texture and mineral content. Usually two or more minerals combine to form different rock..

About AD1600, William Gilbert, who was a court physician of Queen Elizabeth of England, performed certain experiments using spherical lodestones. When he placed small, pivoted magnetic needles at different positions on this sphere, he found that their behavior was quite similar to that of magnetize..