Can someone tell me the youngest to least rocks

How do oceanographers measure the salinity of ocean water?

One of the main reasons societies settled along rivers in the neolithic era was because a) the village elders demanded it. b) the land there was more valuable. c) it was more safe and secure there. d) it provided irrigation for farming.

Which of these are abrahamic faiths check all that apply a.judaism b.roman catholicism c.islam d.buddhism