Geological Time Scale and Fossils

Produced when sediments fill in a cavity made when an object decayed 

• cast
• mold
• original remains

Tags

NGSS.MS-LS4-1

Cavity in a rock made when an organism decayed

• cast
• mold 
• original remains

Principle that states in a sequence of undisturbed rocks, the oldest rocks are on the bottom and the rocks become progressively younger toward the top 

• superposition 
• uniformitarianism
• half-life

Tags

NGSS.MS-ESS1-4

Method by which a geologist can calculate the absolute age of the rock by knowing the half-life of an isotope 

• radiometric dating
• relative dating
• absolute dating

Time it takes for half of an isotopes atoms to decay 

• relative age 
• absolute age 
• half-life

Tags

NGSS.HS-PS1-8

Fossil of thin layer of carbon atoms and molecules 

• original remains 
• carbon film
• trace fossil

Formed when original material in skeletal remains are replaced by minerals 

• original remains 
• fossil
• permineralized remains 

Fossils of species that existed for  short periods and were widespread 

• trace fossils 
• index fossils 
• original remains 

Correctly sequence the layers of rocks oldest to youngest 

• A,B,C,D
• D,C,B,A

Tags

NGSS.MS-ESS1-4

Where are most fossils found?

• A. In sand dunes
• B. In volcanoes
• C. In igneous rocks 
• D. In sedimentary rocks 

Tags

NGSS.MS-ESS2-3