How did the conflicts and crises of the first half of the 20th century impact the world?

The first consequence was the widespread deaths and injuries. First World War had killed 10 million people and the Second World War had killed 20-25 million people. 2. The 2 wars had created a regime of lethal arms, especially in nuclear and chemical weapons.

radioactive dating, also known as  radioisotope dating  is a process that in  estimating the approximate  age  of  rocks. these data can be analyzed from  the studies dealing with the  decay of the radioactive elements that are present in these rocks. in nature, there are a few types of materials or atoms which are quite unstable and they spontaneously decay or breakdown to form other kinds of atoms.