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Extra credit

science rules!
Across
A fossil that is an organisms shape formed when minerals seep into a mold
A scientist who studies fossils to learn about organisms that lived long ago
A record of the geologic events and life forms in earths history
One of the units of geologic time into which geologists divided eras
An igneous rock layer formed when lava flows onto earths surface then hardens
Change over time the process by which modern organisms have descended from ancient organisms
A break in earths crust along which rocks ,one
A type of fossil consisting of an extremely thin coating of carbon
The age of a rock compared to the ages of other rocks
Down
Term used to refer to a group of related organisms that have died out or are no longer living members
The time it takes for half of the atoms of a radioactive element to decay
An igneous rock layer formed when magma hardens beneath earths surface
A gap in geologic record that shows where rock layers have been lost due to erosion
One of the three long units of geologic time between the precambrian and the present
A fossil in which minerals replace all or part of an organism
The age of a rock given as the number of years since the rock formed
A type of fossil that provides evidence of the activities of ancient organisms
A type of fossil that is a hollow area in sediment in the shape of an organism or part of one
Fossils of widely distributed organisms that lived during a geologically short period
Preserved remains or traces of an organism that lived in the past