The most populous cities in the northeast are

_in the farming regions

.along the atlantic coast

,in the appalachian mountains

? along inland waterways

What is the approximate chemical composition of the solar nebula?

What is the border between layers a through f and layer g called?

The first atomic explosion was detonated in the desert north of alamogordo, new mexico, on july 16, 1945. what percentage of the strontium-90 ( yr) originally produced by that explosion still remains as of july 16, 2016?