Early scientific attempts st determining Earth's age gave a number that was around 4.6 billion years old.
<h3>Radiometric dating methods</h3>
The age of rocks can be most determined by radiometric dating.
This process of radiometric dating makes use of two different isotopes of a sample.
It is known that Radioactive isotopes break down within a known amount of time and this enables geologists to determine the age of a sample with the aid of equipment like thermal ionization mass spectrometer.
Learn more about Radiometric dating at
That would just be called Weathering and Erosion. Erosion happens when rocks and sediments are picked up and moved to another place by ice, water, wind or gravity. Mechanical weathering physically breaks up rock. One example is called frost action or frost shattering. Water gets into cracks and joints in bedrock.
I think it would be the second one- Basic tools and reliance on human and animal labor :)
It seems that you have missed the necessary instructions for us to answer this question so I had to look for it. Anyway, here are the acronymic terms for the given world capitals above. So, five world capitals in any order: CPH, ND, WAW, LDN, MAD. Hope this answers your question.
