Almost all fossils are preserved in sedimentary rock. Organisms that live in topographically ... each of the three rock types has been continuously formed and recycled into other types of rock in a ...

Life on Earth has always depended on nitrogen. As a building block of proteins and DNA, nitrogen is essential to all living ...

I am a chemical sedimentologist: I study how and why chemical sediments form and lithify, with the goal of better understanding how chemical sedimentary rocks (e.g., carbonates ... and models to ...

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 ...