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Fossil Review

Across
These parts of organisms are what usually turn into fossils
A gap in the rock layers, usually due to erosion
What are the preserved remains or traces of once living organisms
These are fossils that are widely distributed, and only lived for a short period of time
This type of fossil involves animals preserved with little or no change
When you compare the ages of rocks and rock layers, it is called _______
Rock layers are always ______ than the faults that go through them
Organisms that no longer exist on Earth are said to be ______
The age of a rock since it formed is called its ______.
Down
Footprints and trails are examples of _______
These are formed when minerals replace all or part of an organism
Fossils are helpful in showing us how life, the surface and environments have _______ over time
The Law of ________ says older rock layers are on the bottom and newer rock layers are on top
Plants are usually preserved in this way, with a thin layer of carbon on a rock
Fossils are found in this type of rock
Fossils form when things die, get ______ by sediment, turn to stone, and then weathering and erosion expose it at the surface
Intrusions are always _______ than the rock layers they flow through