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Question Answer
Index Fossils a fossil that is useful for dating and correlating the strata in which it is found.
Lithosphere A lithosphere is the rigid, outermost shell of a terrestrial-type planet or natural satellite that is defined by its rigid mechanical properties
Extinction In biology and ecology, extinction is the end of an organism or of a group of organisms, normally a species.
Law of Superposition Geology. a basic law of geochronology, stating that in any undisturbed sequence of rocks deposited in layers, the youngest layer is on top and the oldest on bottom, each layer being younger than the one beneath it and older than the one above it.
Unconformities An unconformity is a contact between two rock units in which the upper unit is usually much younger than the lower unit.
Divergent A tectonic boundary where two plates are moving away from each other and new crust is forming from magma that rises to the Earth's surface between the two plates.
Convergent is a region of active deformation where two or more tectonic plates or fragments of the lithosphere are near the end of their life cycle.
Transform Transform boundaries are places where plates slide sideways past each other
Faults The fracture zone that forms a transform plate boundary is known as a transform fault
Evidence of Climate Changes is a change in the statistical distribution of weather patterns when that change lasts for an extended period of time
Plate Tectonics Plate tectonics is a scientific theory describing the large-scale motion of seven large plates and the movements of a larger number of smaller plates of the Earth's lithosphere,
Continental Drift Continental drift is the movement of the Earth's continents relative to each other,
Absolute Age Absolute age is the true age of a rock or fossil.
Relative Age Relative dating is the science of determining the relative order of past events
Half-Life the time taken for the radioactivity of a specified isotope to fall to half its original value.
Stratifaction the arrangement or classification of something into different groups.
Eon an indefinite and very long period of time, often a period exaggerated for humorous or rhetorical effect
Era a long and distinct period of history with a particular feature or characteristic.
Period a length or portion of tim
Epoch a period of time in history or a person's life, typically one marked by notable events or particular characteristics

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