Clues to Earth pasts

Fossil:Are the rremains of prehistoric times

permineralized remains: Fossils in wich enside there are filled with minerals.

Carbon film: the film thin carbon residue

mold: cavity in the rock



Cast: a copy of the original object

Index fossils: remains that existed on earht in shots period of times

Principle of superposition: say that the oldest rocks are on the bottom

relative age: comparison with others thigs

unconformities: gaps in rocks sequence

Absolute age: the age in years.

half life: the time that takes an atom to decay

 

radiometric Dating: calculation of the absolute age of a rock

uniformitarianism: earth process ocuring today are similar from the one of the past.

radioactive decay: process of breaking down.