Fossils are the remains of prehistoric plants or animals that somehow managed to be preserved for thousands of years. We have many unanswered questions because very few fossils have survived. Some fossils become petrified, which means they turn to stone. Petrifaction occurs when rivers and streams carry dissolved minerals to the porous parts of bones, shells or wood. The minerals eventually crystallize and settle, filling the pores.
Archaeologists are like poli ce detectives.
They search for clues left behind by people, animals, and things. Archaeologists use those clues to make educated guesses about the past. What we know about prehistory changes over time as archaeologists uncover new clues. We don't know what archaeologists will discover in the future, but if the past is any guide, what we think we know about prehistory will change as we learn more about the past. I think this is the best archaeology resource on the net.