Vocabulary Crossword

A scientist who studies fossils to learn about organisms that lived long ago
A type of rock that forms when particles from other rocks or the remains of plants and animals are pressed and cemented together. Type of rock where fossils can be found
A preserved remanent or impression of an organism that lived in the past
Fossil formed when minerals Replace all or part of an organism
Fossil formed when an organism buried and sediment dissolves, leaving a hollow area.
A copy of an organisms shape created with minerals fill in heart inside a mold.
A type of fossil that is an extremely thin coating of carbon on rock.
Any indirect evidence of life preserved as an impression in rock; trails, foot prints, and bite marks.
A fossil that forms when the organisms or parts of an organism are prevented from decaying by being trapped in ice, tar, or amber.
Assigning an age to the earth (4.6 billion years old) and landforms on the earth through the use of two different methods - relative dating and absolute dating
The age of a rock compared to the ages of rock layers.
Method of determining the age of a fossil by comparing its placement with that of fossils in other layers of rock.
A fossil that is used to establish the age of a rock layer because the fossil was distinct, abundant, and widespread and the species that formed that fossil existed for only a short span of geological time.
A crablike invertebrate that is the most common fossil of the Cambrian period, used as an index fossil.
The actual age in years of an event or object
A technique used to determine the actual age of a fossil on the basis of the amount of a radioactive element it contains, as a result radioactive decay.
The breakdown of a radioactive element, releasing particles and energy
The time it takes for half of the radioactive atoms to decay