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PC Geologic Time

QuestionAnswer
The mineralized remains of organisms, showing how long-dead organisms lived and how their bodies were structured. Fossils
What is a bed or layer of sedimentary rock having approximately the same composition throughout? Rock Strata
How old is the earth? 4.6 Billion years old
System of chronological measurement that relates stratigraphy (study of rock layers) to time Geologic time scale
The mineralized remains of organisms and the rock layers in which they are found Fossil Record
The study of rock layers Stratigraphy
Fossils are often found in sedimentary rock. In undisturbed sedimentary rock, where would the oldest fossils be found? The bottom layer
The quality or state of having many different forms, types, ideas, etc. Diversity
Fossils of simple organisms have been found at the bottom of rock layers, while more complex organisms have been found at the top. What information can this give us? Organisms evolve over time, with more Complex organisms often evolving from simpler organisms.
The arrangement of things in the order that they occurred Chronological order
The permanent disappearance of a species from Earth Extinction
The scientific law that states fossils located in deeper sediment layers are older than ones deposited in layers closer to the surface Law of Superposition
The formation of fossils as stone replaces decaying tissues Petrification
Fossils can usually be found in layers of Sedimentary rock
Which of the following can help to determine the age of a fossil? The relative position or location of the fossil within layers of rock
The science that deals with the dynamics and physical history of the earth, the rocks of which it is composed, and the physical, chemical, and biological changes that the earth has undergone or is undergoing. Geology
__________________ fossils are formed when all or part of an organism is covered in a solid substance, such as ice or amber, that preserves the material trapped inside. Inclusion
__________________fossils are formed when part of an organism has been buried in sediment and slowly decayed. The dead organism creates an impression in the soft sediment. The sediment then hardens into solid stone, preserving the impression in stone. Mold
For a_________________ fossil to form, a dead organism must first be buried in sediment. Then, as the organism slowly decays, it leaves behind open spaces where minerals crystallize and fill in the exact shape of the decaying organism or part. Cast
___________________fossils are fossils that are formed not by the actual dead organism but by its activities while it was alive. Examples of trace fossils include animal tracks preserved in stone, petrified nests, burrows, dung, etc. Trace
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