The rocks on Earth are constantly changing due to many different processes. There are three main types of rock, with rocks changing between each type over millions of years. This rock recycling is ...

The history of life on our planet is a long and winding path. Much of what we know about how life has evolved comes from fossils. The physical remains of organisms and the evidence of behaviors, such ...

New research into fossilized rock formations in Zimbabwe is shedding light on Earth's nitrogen cycle before the rise of atmospheric oxygen. Scientists analyzing ancient stromatolites—layered ...