Sea floor spreading adds more crust to the ocean floor and at the same time older strips of rock move outward from either side of the ridge.
It's called the Social Security Trust Fund, and it's typically taken directly from wages. If you ever get a job, on your pay stub there will be a deduction that's usually just called "SOCIAL SECURITY". So, largely payroll taxes.
The first step of the scientific method is to pose a question or problem to be investigated.