The origin of life on Earth is a controversial topic in the natural sciences. The current widely-accepted scientific theory about the origins of life on Earth is known as the nebular hypothesis, or simply out of equilibrium chemistry. Perhaps the most fundamental and at the same time the least ...

It is not very likely that the total amount of water at Earth’s surface has changed significantly over geologic time. Based on the ages of meteorites, Earth is thought to be 4.6 billion years old. The oldest rocks known are 3.9 billion to 4.0 billion years old, and these rocks, though altered ...

The Lithosphere is the outermost layer of the Earth. The lithosphere is divided into two parts namely the crust and the uppermost part of the mantle. Our planet has an outer solid, rocky layer which has all its plates moving on top of it continuously. They are called tectonic plates. They are ...

The earth has a layered structure. From the outermost end of the atmosphere to the centre of the earth, the material that exists is not uniform. This is because it has a layered structure. The materials found in these layers are not uniform in their composition and density. From the surface ...

The Moon is Earth’s only natural satellite and the fifth largest moon in the solar system. The Moon’s presence helps stabilize our planet’s wobble and moderate our climate. The Moon’s distance from Earth is about 240,000 miles (385,000km). The Moon has a very thin atmosphere called an ...

Many of us have wondered what is our solar system structure, and why is it the way it is. There are eight planets orbiting our sun in a relatively stable and regular position. The planetary orbits have been set so as to produce a balance called the force equilibrium which helps to avoid ...

Early Theories The Nebular Hypothesis, originally proposed by Immanuel Kant was the first scientific hypothesis for the origin of the Solar System. The 'nebula' referred to is the vast cloudy interstellar medium that consists of gas and dust, in which new stars are born. This hypothesis ...

Geography is divided into two main branches: human geography and physical geography. There are additional branches in geography such as regional geography, cartography, and integrated geography. Integrated geography combines physical and human geography by taking into account all natural systems, ...

Geography is concerned with the Description and explanation of the areal differentiation of the earth’s surface. Now, whether you think that sentence was creative, entertaining or even poetic, it’s certainly accurate. Geography is an all-encompassing discipline that focuses on the ...

Tourism has become one of the major factors that shape the global economic landscape. The tourism industry is one of the largest and fastest-growing sector, and continues to expand and change to accommodate a growing number of tourists and travelers. More than 15 million people are directly ...