Petrification happens when the organic material is slowly replaced by minerals. Making a fossil is tricky and the conditions have to be just right.Some fossils are the actual remains of a plant or animal that has been frozen in ice or trapped in a substance like sap. Despite this, there are several different ways for a living thing to become a fossil.
After death the amount of carbon-14 in the organic specimen decreases very regularly as the molecules decay.
Carbon-14 has a half-life of 5,730 ± 40 years, meaning that every 5,700 years or so the object loses half its carbon-14.
A cast fossil is a fossil made when an organism that is buried in sediment decays and leave behind a mold, or hollow impression in its shape.
A cast fossil is like a mold fossil, but in the case of a cast fossil the mold has been filled with minerals.
When we think of fossils, the first things that come to mind are the bones of dinosaurs; but a fossil can be anything.
Footprints, flowers, even droppings; all of these things can be turned into fossils under the right conditions.
The oldest fossils ever discovered are more than 3.5 billion years old.
Fossils are found all over the world and on every continent.
A paleontologist is a scientist that studies fossils.