The eighth wonder of the world, this seemingly simple puzzle. But scientists still do not solve the issue.

We have nothing to human studies seriously, whether the world is flat, cylindrical terminal. The length of 40,000 kilometers around the world, with a diameter of about 12 700 km or spender at all with the results of the study came out. There are eight simple questions about the world that there is no answer yet.

1. Water Come From?

Scientists say But the world should be dry rock. After WWII, due to a combination of heavy elements at 4.5 billion years ago. But I think it comes from H2O, or water. Because the rocks The remnants of a massive explosion and then disappeared. There is no evidence for exploration

2. What is the Center of the Earth as well.

In 1940, scientists found that the steel with nickel on the surface of the Earth are very rare. I think both should be in the center of the world. But the theory of gravity in 1950, said both steel and nickel lighter than the center of the world. Until now, scientists had to find out what exactly is in the center of the Earth.

3. moon coming up?

Scientists have found that the chemical composition of the moon, like Earth. It was concluded that the moon may be a large rock that fell out of the world. But was rejected because the world is unlikely to object to such a large size.

4. creature came from.

The basic components of living things. Amino acids and vitamins have been found in meteorite fragments from ice or even at extreme environments. To find out which components are formed as a new creature, how is the widest in the most difficult of the biology. Because there is no clear evidence

5. have also oxygen.

Cyanobacteria Release oxygen in the form of waste. And the sky filled with Jane Ogden's 2400 million years ago, when the scientists examined fossils from rocks on Earth. Found that the level of oxygen on Earth rose and fell quickly than ever before, and there are three billion years, so what conclusions did not ask what caused the oxygen on Earth.

6. Cambrian explosion happened.

Cambrian Explosion or Biological Big Bang occurred after the age of 4 billion years of life on many concurrent. Looks weird A creature invertebrate marine living with cerebral blood vessels and heart. Oxygen is the cause of increasing it. No one has the answer

7. When will accurately predict earthquakes.

Current technology exists to have only a forecast. Tell likelihood of earthquakes. But people still do not know the time will come when, where or how dangerous. Which is similar to the weather forecast is not accurate to say all the time.

8. The Tectonics of lithosphere starts when.

Plate Tectonic or the movement of tectonic plates. Divided into seven plates happens when the well. Because of evidence that began when it was destroyed, lost long ago. Only Zircon (Zircon), only enough to survive the destruction of the evidence when it was 4.4 billion years ago. 

Source: Next Step