Geologic time scale
arrangement of events used as a measure of the relative or absolute age of any part of geologic time
Sedimentary Rock
Rock that forms when sediment from erosion is composed together
Erosion
when sediment are moved by wind and/or water
Deposited
when sediment stops moving and collects in a new area
Weathering
when rocks are broken down into smaller pieces
Intrusion
when molten rock from inside Earth moves through cracks in the rock layers. this molten rock will sometimes reach through and break the surface.
Relative Dating
the age of something based on its placement
Absolute dating
the exact age of something
Fossil
preserved evidence of past life
Plate tectonics
the movement of Earth’s plates that can cause rock layers to shift
Extinction Event
A widespread and rapid decrease in Biodiversity in a relatively short geological time frame
Eon
The largest segment of time in the geological time scale of Earth.
