What evidence led to the conclusion that earth's core is mostly iron?

uuum how? to take a test for you or

this is my opinon on puritians

puritans we all know as were a relgion to purify the cahtlic church some of there practices were good and they did ways some relgions couldnbt but some ways wern't that good like trying to turn people into their relgion which did spark alot of mass hate to them overall there netrual and did have a semi good cause.