Section 1 Fossils
Terms
undefined, object
copy deck
- cast
- a solid copy of the shape of an organism
- index fossil
- fossils of widely distributed organisms that lived during only one short period
- fossils
- preserved remains or traces of living things
- trace fossils
- provide evidence of the activities of ancient organisms
- scientific theory
- well-tested concept that explains a wide range of observations
- absolute age
- is the number of years since the rock formed
- carbon film
- an extremely thin coating on rock
- extrusion
- lava that hardens on the surface
- evolution
- is the gradual change in living things over long periods of time
- relative age
- a rock is its age compared to the ages of other rocks
- paleontologists
- scientists who study fossils
- petrified fossils
- fossils in which minerals replace all or part of an organism
- intrusion
- magma that hardens into a mass of igneous rock
- mold
- hallow are in sediment in the shape of an organism or part of an organism
- law of superposition
- used to determine the relative ages of sedimentary rock layers
- extinct
- no longer exists and will never live on earth again
- sedimentary rock
- type of rock that is made of hardened sediment
- unconformity
- the surface where the new rock layers meet a much older rock layer beneath them