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Fossils

Clues to Earth's Past

QuestionAnswer
Remains of organisms that lived long ago. FOSSIL
Hollow area (opening) in a rock that has the shape of an extinct organism. MOLD
Organisms that once lived on the earth, but are no longer found alive. EXTINCT SPECIES
A copy of an organism in rock. CAST
Specific age of a rock or a fossil. ABSOLUTE AGE
In horizontal sedimentary rock layers the oldest layer is at the bottom and each layer is younger than the layers below it. LAW OF SUPERPOSITION
Age of an objected compared to another object. RELATIVE AGE
Trace of an organism that lived in the past(footprints and burrows). TRACE FOSSIL
Fossil of an organism that existed on Earth for a short period of time. INDEX FOSSIL
Igneous rock formed on Earth's surface. EXTRUSION
Process in which an element breaks down and changes into another kind of element. RADIOACTIVE DECAY
Fossils are usually found in _______________ rock. SEDIMENTARY
Dead organisms that have turned to stone. PETRIFIED FOSSILS
Thin layer of carbon on rock. CARBON FILM
A mass of igneous rock below the Earth's surface. INTRUSION
Measure of how fast an element breaks down. HALF-LIFE
Gap in rock sequences (develops when agents of erosion, such as running water or glaciers remove rock layers by washing or scraping them away). UNCOMFORMITY
A break in the Earth's crust. FAULT
Created by: gizmo131
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