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Prentice Hall

Chapter 4 section 1-2 vocab

TermDefinition
Fossil The preserved remains or traces of living things
Sedimentary rock The type of rock that is made of hardened sediment
mold A fossil formed when an organism buried in sediment dissolves, leaving a hollow area
cast A fossil that is a solid copy of an organism's shape, formed when minerals seep into a mold
petrified fossil a fossil in which minerals replace all or part of an organism
carbon films A type of fossil consisting of an extremely thin coating of carbon on a rock
trace fossil a type of fossil that provides evidence of the activities of ancient organisms
paleontologists a scientist who studies fossils to learn about organisms that lived long ago
scientific theory a well-tested concept that explains a wide range of observations
evolution The process by which all the different kinds of living things have changed over time
extinct Describes a type of organism that no longer exists anywhere on earth
relative age The age of rock compared to the ages of rock layers
absolute age The age of rock given as the number of years since the rock formed
law of superposition The geologic principal that states that in horizontal layers of sedimentary rock, each layer is older then the layer above it and younger than the layer below it
extrusion An igneous rock layer formed when lava flows onto Earth's surface and hardens
intrusion An igneous rock layer formed when magma hardens beneath Earth's surface
fault A break in Earth's lithosphere along which the rocks move
unconformity A place where an old , eroded rock surface is in contact with a newer rock layer
index fossil Fossils of widely distributed organisms that lived during only one short period
Created by: 100003690863273
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