How old are the oldest rocks on the ground?

Since 2008, the oldest rocks on Earth have been known for 4.03 billion years, from the rolling route in the northwest territories in Canada. These rocks were found in the Canadian shield, very ancient parts of the Earth's crust. Originally the rock was part of a very old mountain chain, whose core was exposed to billions of years due to glacial activity. The rock was formed during the Hadee period, the oldest geological division of time on Earth, which began on the formation of the planet 4.57 billion years ago and continued to the dawn of Archaean, 3.8 billion years ago. Many of the oldest rocks in the world come from this era.

Another extremely old rocks were found in Western Greenland and Western Australia. These are at most 3.8 billion years and their age is used as a dividing mark between Hadean and Archhean Eons. The continental bark as a whole is quite old, with ages in billions of years. This is quite different than the oceanic bark, what is continuously recycled through subduction zones and has an average age of only 100millions of years.

Even older than Acasta Gneiss are individual zircons from Jack Hills, Australia, dated 4.4 billion years ago. These are the oldest rocks that created only 130 million years after the country's creation and represent when Krusta first began to cool. The Earth was initially in a completely molten state and cooled only after the energy was dispersed from its contraction - these zircons represent this first cooling. The controversial aspect of Jack Hill's discoveries is that the zircons seem to have formed in the presence of liquid water, which was previously not considered to be existed on the Earth's surface up to about 3.8 billion years ago. So it turns out that the oceans may be much older than we thought, although the analysis is controversial here.

It is assumed that less than 7% of the world continental rock is older than about 2.5 billion years. Although continents are relatively stabilOver time, they are regenerated due to volcanism and erosion on massive scales. The thermal flow on the Earth's surface in very antiquity was about three times what is today, which led to a rapid recycling of crustal material. Further research will be necessary to reveal more of the oldest rocks and their use as traces for conditions that existed in the earliest era of the history of our planet.