The layers of rocks, the ancient treasures that are at the bottom of the sea, how old the coral is. But I don't think they determined how old it is, how would the dinosaurs that lived in water swim or any drink water. I don't know if this helps but hopefully it does. Also scientist have made advanced tech that could help with the age determination of the ocean floor.
Answer:
shivering
Explanation:
the movement of your muscles creates friction between them, which produces heat, thus warming our bodies up.
The tumor is growing and the tumor cells are distructive by damaging his brain and soon he will start to loose some function as memory or speech. The tumor must be under a radion treatment or removed imediatelly if that is possible.