Kelly is a rock collector. He thinks that the material from his favorite sedimentary rock in his collection might have been part of an igneous rock formation under Earth's outer layer millions of years ago. QUESTION Could Kelly be correct?

Absolutely, Kelly could be onto something interesting! Sedimentary rocks, formed from the accumulation of materials, can sometimes contain minerals and fragments that originated from igneous rocks, which are created from the cooling and solidification of magma or lava. Geological processes over millions of years can transport these igneous remnants through erosion and sedimentation, leading to fascinating blends in sedimentary formations. Furthermore, tectonic activity can also play a role in mixing different types of rock. When plates move, they can push sedimentary rocks over igneous formations, allowing for intriguing interactions between the two. This makes Kelly's rock collection not just a trove of minerals, but also a history book of Earth's dynamic processes!