Nerd Words Crossword

Processes that shaped/formed the earth in the past are the same processes that shape/form the earth today
The actual age of a fossil, rock layer or how long ago an event occured
Layers of sedimentary rocks that record how species change over time and show how different species relate to one another
The length of time it takes for half of the atoms in a sample of radioactive element to decay into atoms in a stable element
A fossil of an organism that existed for only a sort time , were common, and lived in many areas around the world
When molten rock cuts through sedimentary rock layers and cools into igneous rock layer is younger than the sedimentary layers it cuts through
The observation that groups of plants and animals follow each other in time in a predictable manner
In undisturbed rock layers, older layers of rock lie beneath younger rock layers
A method for measuring the age of a material by comparing the amount of a radioactive element within a rock or fossil to the amount of its decay product
Describes the age of a fossil or event in comparison to other fossils or events
A type of rock formed by sedimentation of material (sand, silt and clay) at the earth's surface and within bodies of water
When a rock layer is missing from one area of a rock bed. This may be caused by erosion or plate movement