can somone please answer the first 4 in the screen shot.(Non topic)also i will be posting all the questions on my account so if you go there and awnser i will give free brainliest.)

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?

What is the biggest country in south america?

Cardueline finches can be found in what areas of the world?