After reviewing the graph you posted above, there is one radioactive isotope that has a half life that is approximate to the same as the estimated time of the origin of Earth.
The radioactive isotope is called Uranium 238. You can also write this out as U-238 or uranium/u. Any of these are acceptable for the answer.
The Rocky Mountains is the largest mountain system in N.A
hears a region for you region V. bicol or Philippines or sorsogon
Water<span> sinks in high-lat </span>regions<span>, initiating </span>deep<span> currents that help regulate plant's . north atlantic ocean</span>
D. urbanization is always good for the environment
