What technology led to people settling down in communities and starting a civilization?

In a scientific experiment, a is any factor that can be changed or be changed

You have been tasked with sorting the rock samples shown into three categories, with two rocks in each category. what attribute would you use to sort these rocks? which rocks would be in each category? rocks: obsidian, coquina limestone, granite, soapstone, pumice, and gneiss.

Who developed the theory of plate tectonics?