Rocks are often the only witnesses to a planet's distant past. Their color, shape, and scars tell a story about what happened to the planet long ago. Rocks are usually found in layers with the oldest at the bottom and the youngest at the top. But a major event, such as an earthquake or an asteroid impact, disrupts these layers, leaving behind a record of when and where catastrophic events occurred.
Examines rocks to learn about a planet's history
Find out how Adriana went from pretending to explore outer space as a kid to working for NASA.
Travel with Adriana as she digs up dirt on a 65-million-year-old mystery.
Break open some chocolate chip cookies and research the ingredients.
"It's the dream of every child to get to play in the dirt. We geologists get to do it for real."
See Adriana in action as she digs up some answers about our planet's past.