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Earth History

Earth History Vocabulary

QuestionAnswer
Geologic Time Scale Record of events and organisms that have occurred throughout Earth’s History
Extinction The permanent disappearance of a species
The permanent disappearance of a species Are the preserved remains or traces of an organism that lived in the past.
Trace Fossils formed when the mud or sand hardens into stone where a footprint, trail, or burrow of an organism was left behind.
Half- Life The time take for radioactivity of a specified isotope to fall to half its original value
Igneous Rock are defined as types of rocks that are formed when molten rock (rock liquefied by intense heat and pressure) cools to a solid.
Index Fossils A fossil of an organism that lived only during a short part of Earth’s history and found over a wide area of Earth, organisms must be unique.
Sedimentary Rocks type of rock formed when sediment is pressed or cemented together naturally in layers at the Earth’s surface.
Metamorphic Rock are defined as types of rocks that are formed when molten rock (rock liquefied by intense heat and pressure) cools to a solid.
Law of Superposition The law that states that in any undisturbed sequence of rocks layers, the youngest layer is on top and the oldest on bottom.
Radioactive Dating method of determining the age of fossils or rocks that is based on the rate of decay of radioisotopes
Absolute Age The exact age is known due to radioactive dating.
Relative Age Inferring the age by comparing it with another fossil or rock where the age is known.
Carbon -14 A radioactive isotope which is present in organic materials and is the basis for radiocarbon dating
Isotope Atoms of the same element that have the same number of protons but different numbers of neutrons
Relative Dating method of Comparing the age of two or more objects
Unconformity A gap in the geologic record
Era a long and distinct period of history with a particular feature or characteristic
Faults Cracks within the Earth’s rocky crust where rock has been fractured and can move past each other.
Ice Core Core sample from the accumulation of snow and ice over many years
Created by: bmsscience
 

 



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