The actions noted are those that anyone around the world can use to work together to use energy more efficiently.
I do most of those things now; I have trouble remembering to unplug items not in use.
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The answer is : Mexicans Cession
Answer:
Radioactive isotopes are unstable and will decay. ... The isotopes will decay into a stable isotope over time. Scientists can tell how old the rock was from looking at the radioactive isotope's half-life, which tells them how long it would take for there to be half the radioactive isotope and half the stable isotope.
