Describe the trench warfare. What were they? How big are they ?

The Trench Warfare is a land that is always occupied during war, This let's the Soldiers stay protected from the Enemies Gun Fire. These Trenches are 1-2 Meters Wide, and 3 meters deep.

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asked for and recieved from the united states

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.