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GEOGRAPHY

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The study of places and the interactions between people and their environs is known as geography. Geographers study the surface of the Earth and the various human societies that live there. The ancient Greek scholar Eratosthenes is referred to be the "father of geography." He was the first to use the term "geography," and he also possessed a small-scale understanding of the planet, which enabled him to calculate the earth's diameter. Eratosthenes was a multi-talented individual. As the Greek philosopher and explorer Herodotus showed in the fifth century B.C, knowledge was amassed about such novel and exotic locales. That knowledge came to be known as geography, a term first used in the third century B.C. as the title of Eratosthenes of Cyrene's book Geographica. Table of contents THE BIG BANG THEORY STAR THE SOLAR SYSTEM MEMBERS OF THE SOLAR SYSTEM UNIVERSE The universe is commonly defined as the totality of everything that exists,including all physical matt...
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INTERNAL STRUCTURE OF THE EARTH

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THE EARTH'S CRUST   The outermost solid cover or shell of the earth is well known as the earth's crust . The thickness of the crust is about 30km. It is the thicker in the region of the continents and thinner in the region of the ocean floors. The density of rocks in the earth's crust ranges from 2.7 to 3 g/c.c(grams per cubic centimeter). The upper part of the crust consists of silica and aluminium in greater proportions.That is reason,its called ' Sial '. Where as the lower part of the crust is called ' sima ' because the proportion of silica and magnesium is higher in this part Table of contents MANTLE CORE   ROCKS IGNEOUS ROCKS SEDIMENTARY ROCKS METAMORPHIC ROCKS MANTLE   This layer lies below the crust. Its thickness is about 2900km and the density of substance in the mantle ranges  from 3.0 to 4.7 . CORE The earths core lies below the mantle.Its thickness may be about 3471 km. Its radius is 6371km,according to IUGG . Its divided into two parts,the o...
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EARTHQUAKE DEFINATION,CAUSES AND EFFECTS

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An  earthquake? Any sudden shaking of the ground brought on by seismic waves passing through the planet's rocks is referred to as an earthquake. When a kind of energy held inside the Earth's crust is abruptly released, typically when masses of rock rubbing up against one another unexpectedly crack and "slide," seismic waves are created. Geologic faults, which are confined areas where rock masses can move in relation to one another, are where earthquakes happen most frequently. The largest tectonic plates that make up the crust of the Earth are where the majority of  the world's major fault lines are found. TABLE OF CONTENTS 1906 San Francisco Earthquake Earthquake causes origins What is Seismology? What causes earthquakes Keypoints Mapping Earth's Inferior External links Prior to the development of seismology at the beginning of the 20th century, nothing was known about earthquakes. Seismology , the scientific study of all elements of earthquakes, has provided...
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