Skip to main content

WHAT ARE CELLS MADE OF?

How do we discover what is inside the Earth?

What is the external structure of Earth?

It has been known for more than 2000 years that the Earth is round, but we were able to actually see this much later only when we flew into space. The knowledge why we do not fall off from Earth is much more recent. A journey as describes by author Jules Verne in his book Journey to the center of the earth was, after all, impossible. Only one thing was known: The earth is made up of soil, rocks and water. Today, we know that the Earth is also surrounded by an air cover called the atmosphere.

 





What is the internal structure of earth?

Like an onion, the Earth has several layers. The outermost layer, the Earth’s crust, has an average depth of about 40km. As compared to the diameter of Earth, which is around 12,700 km, the crust is very small. It is primarily made up of solid rocks. Below the crust is the solid mantle, reaching to a depth of about 2900 km. due to the heat inside the Earth, the mental consists of solid and molten rocks. Below the mental is the core, made up of iron and nickel. The deeper one travels inside the Earth, the hotter it is. The temperature in the core is 4000 to 5000 degree C.

 


 

How do we discover what is inside the Earth?

Caves and mines go only up to one to two km inside the Earth. Even the deepest wells of the world, such as the one 12 km deep in Russian Kola Peninsula or the 9-km-deep one in Upper Palatinate, hardly scratch the Earth’s crust! One can ‘look’ deep inside the Earth in aftermath of earthquakes or by creating nuclear explosions. The explosions generate sound or seismic waves. They also throw off rock particles. By measuring their intensity and timings, scientists discover the composition of the Earth’s interiors.

 

How did we discover that the Earth is round?

Around 3000 years ago, people believed that Earth was flat. But people wondered why ships disappeared at the horizon. Sailors too returned from journeys and were proof that the ships did not fall off from the edge of the Earth. The simplest explanation was: the earth must be round. The final proof came in the year 1522 after the expedition of Ferdinand Magellan, who was the first to sail around the Earth.

 

Why do we not fall off the earth?

Gravity is the force of Earth that attracts every object towards itself. From our perspective this force always acts downwards. For a long time people did not believe that the Earth is round because the people ‘underneath’ the sphere would have actually fallen down. In 1687, Ser Isaac Newton proved that the force of gravity always acts towards the center of the Earth. On the Earth, force of gravitation always acts ‘downwards’ irrespective of Eskimos in the Arctic region, people in Europe or inhabitants of Australia.

 

What is the atmosphere made up of?

The word ‘Atmosphere’ means a gaseous cover enveloping a planet. Without atmosphere life would not have been possible on Earth: one-fifth of the atmosphere is oxygen and four-fifth is nitrogen. Like the Earth’s interior, the atmosphere too is made up of many layers. All animals and plants live in the lowermost layer of the atmosphere called the ‘troposphere’. All weather phenomena take place in the troposphere. Even aeroplanes fly in the outer edge of the troposphere. The stratosphere, the mesosphere, the ionosphere and the exosphere lie above the troposphere.



 

Comments

  1. Wow, gravity , it's really interesting topic, that's why Newton search it. The article is quite helpful who are preparing for exam, like job and other. But it's a quite informative. Thank you .keep it up

    ReplyDelete
  2. very good info https://www.learnandenjoy-physics.com/

    ReplyDelete
  3. Akshita bishnoi the fat one put this on her status

    ReplyDelete
  4. Nice Article, thank you please also read this information in my blog
    The Chinese Brand Smartphone

    ReplyDelete
  5. https://theworldtoday253.blogspot.com/2020/11/oglasio-se-srpski-ambadador-iz-beca.html

    ReplyDelete
  6. How come people have figured out what the earth looks like into its core? The answer to this question is still a myth.

    ReplyDelete
  7. Nice and good article , please also visit my blog
    Best Hosting in Indonesia
    Best Tablet with lower price

    Thank's for sharing mr.

    ReplyDelete
  8. Very informative article..

    ReplyDelete

Post a Comment

Popular posts from this blog

Is Our Brain Bigger Than That of the Dinosaurs?

  What Differentiates Humans from Animals Biologists classify humans as animals and part of the animal kingdom. Like our nearest relatives, the apes, humans are also mammals. Humans have evolved from apes, but there are features that differentiate us from other animals- including apes. These include the upright walk, our opposable thumb, our special ability to communicate by a language, and our highly developed brain. Our brain allowed our ancestors, like the Neanderthals , to invent tools.   Did humans evolve from apes? Today, one can think of humans and apes as cousins. They have common ancestors, but have not descended directly from each other. About 5-7 million years ago, a line of man-like apes grew apart, and evolved independently of the other apes. The oldest, almost completely intact skeleton of an upright ancestor of human- the Australopithecus - was found in 1974 in Ethiopia (Africa). The scientists named it ‘ Lucy’ .   Do animals use tools? Animals do make use o

Why are we thrown forward when brakes are applied?

  Objects fall because the mass of the Earth attracts them. The force that pulls us towards the center of the Earth is known as gravitation. It keeps us on the ground and the satellites in their orbits. This force of attraction is much less on the Moon than on the Earth-only one-sixth. For this reason, the astronauts bounce when they walk on the moon because they experience weightlessness. In the state of weightlessness, we do not feel any force of gravity and do not feel any weight. However, we feel the forces acting on us on the Earth, when we fall from a height or when we are thrown forward when brakes are applied.   What is mass, weight, and density? All objects have a mass. Because of the force of attraction on the Earth, an object has a weight. This is the force with which the body-that is, the mass of the body-is attracted. The force of gravity on the Moon is just one-sixth of that on the Earth. A person who weighs 60 kg on the Earth weighs only 10 kg on the Moon. The dens

Did the earth always look as it does today?

                              No, since its origin about 4.8 billion years ago, our planet has undergone a lot of changes. The initial ball of fire cooled down and the surface slowly turned solid, today we know that the Earth’s crust is divided into several plates, which move continuously. Entire continents have been displaced and mountains, islands, and new seas have been formed or have disappeared. Even the flora and fauna have evolved over time. Many species have become extinct and new ones have been discovered. This development of the Earth over billions of years is known as the history of Earth.                           How many plates does the Earth’s crust have? The relatively sold Earth’s crust-and a part of the layer that lies below it-is divided into seven large and more than ten smaller plates. These plates float over the hot, viscous layer, which is constantly in motion- like boiling soup. These flushes of heat in the Earth’s interior are known as ‘convection cells