2,500 mya: Banded iron formations Banded iron formations (BIFs) are sedimentary rocks deposited extensively on the ocean floor over hundreds of millions of years. Their alternating rust- and gray ...

Use a sturdy, padded ironing board. If you don't have an ironing board, you can still iron by padding a counter, table, or the floor. Check your steam iron to be sure the baseplate is clean.