I think it’s the third option, I’m really sorry if that’s incorrect!!! You might wanna wait for someone else to answer :)
As the earth has active tectonics we know that rocks are recycled and the oldest rocks may therefore just be the oldest rocks that have not been recycled yet. We know the true age of the earth by looking at radioactive isotopes of things like spacedust and meteors that formed at the same time as the earth as they have not been affected by the tectonic process of recycling here on Earth.
It is called a derived character. Hope this helps! (:
They are very very strong tides they have nothing to do with the season spring they occur when the sun moon and Earth are in a line., the gravitational forces of the Moon and the Sun both contribute to the Tides. spring tides occur during a new moon or full moon
Answer:
5 · every skin cell in a human body
