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question		réponse
Fossil commencer à apprendre		The preserved remains or traces of living things.
Sedimentary rock commencer à apprendre		The type of rock that is made of hardened sediment.
Mold commencer à apprendre		A fossil formed when an organism buried in sediment dissolves, leaving a hollow area.
Cast commencer à apprendre		A fossil that is a copy of an organism’s shape, formed when minerals seep into a mold.
Petrified fossil commencer à apprendre		A fossil in which minerals replace all or part of an organism.
Carbon film commencer à apprendre		A type of fossil consisting of an extremely thin coating of carbon on rock.
Trace fossil commencer à apprendre		A type of fossil that provides evidence of the activities of ancient organisms.
Paleontologist commencer à apprendre		A scientist who studies fossils to learn about organisms that lived long ago.
Scientific theory commencer à apprendre		A well-tested concept that explains a wide range of observations.
Evolution commencer à apprendre		The process by which all the different kinds of living things have changed over time.
Extinct commencer à apprendre		Describes a type of organism that no longer exists anywhere on Earth.
Relative age commencer à apprendre		The age of a rock compared to the ages of rock layers.
Absolute age commencer à apprendre		The age of a rock given as the number of years since the rock formed.
Law of superposition commencer à apprendre		The geological principle that states that in horizontal layers of sedimentary rock each layer is older than the layer above it and younger than the layer below it.
Extrusion commencer à apprendre		An igneous rock layer formed when lava flows onto Earth’s surface and hardens.
Intrusion commencer à apprendre		An igneous rock layer formed when magma hardens beneath Earth’s surface.
Fault commencer à apprendre		A break or crack in Earth’s lithosphere along which the rocks move.
Unconformity commencer à apprendre		A place where an old, eroded rock surface is in contact with a newer rock layer.
Index fossil commencer à apprendre		Fossils of widely distributed organisms that lived during only one short period.
Radioactive decay commencer à apprendre		The breakdown of a radioactive element, releasing particles and energy.
Half-life commencer à apprendre		The length of time needed for half of the atoms of a sample of a radioactive isotope to decay.
Geologic time scale commencer à apprendre		A record of the geological events and life forms in Earth’s history.
Era commencer à apprendre		One of the three long units of geologic time between the Precambrian and the present.
Period commencer à apprendre		One of the units of geologic time into which geologist divide eras.
Continental drift commencer à apprendre		The theory that the continents have moved over time.

Earth's History

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