8th Grade Science Earth's History
Terms in this set (10)
is an earth science comprising the study of solid Earth, the rocks of which it is composed, and the processes by which they change
imprints or remains of organisms that were once alive
Geologic Time Scale
The record of the major events and diversity of life forms present in Earth's History. It began when the earth was formed and goes on until present. At the end of each ERA a mass extinction occurred. (Precambrian Era, Paleozoic Era, Mesozoic Era, Cenozoic Era)
fossils which can help to find the relative age of rock layers.
Plate Tectonics Theory
- state that the Earth's lithosphere (or land) is broken into large sections called tectonic plates that move or change position over time.
Law of Superposition
Sedimentary layers are deposited in a time sequence, with the oldest on the bottom and the youngest on the top.
the age of an object or event in comparison to another object or event.
the actual age of a rock or fossil or how long ago an event occurred. Determined with radioisotope dating.
the study of fossils.
an assumption that the same natural laws and processes that operate in the universe now have always operated in the universe in the past and apply everywhere in the universe.
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