the law that states the oldest layers are at the bottom in sedimentary rock
Fossil
When large numbers of fossils are found in a layer of sedimentary rock, a mass _______________ has occured.
Sedimentary rock
scientist who studies fossils to learn about organisms that lived long ago
Paleontologist
Superposition
Intrusion
Extrusion
Absolute age
Extinction
a rock's age compared to the ages of other rocks
the almost exact number of years since a rock formed
when magma forces itself into existing rock and hardens
a layer formed when lava comes to the surface and hardens
Relative age
layers of sediment compressed into rock
the preserved remains or traces of living things
