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Terms in this set (14)
A bed or layer of sedimentary rock that is the same throughout - a rock layer.
A fossil that is common and found in many locations - this helps to define and determine the geological time period.
Relative dating or Relative Age
A way to determine the age of a rock by comparing it to other rocks.
Absolute dating or Absolute Age
The number of years since the rock formed. Actual age of the rock.
Law of Superposition
In horizontal sedimentary rock layers, the oldest rock is at the bottom. Each higher layer is younger than the layer below it.
A type of rock formed when sand, mud, and pebbles get laid down in layers. Over time the layers get squashed under pressure and form a new rock.
Geologic Time Scale
A system of chronological measurements that connects the study of rock layers to time.
Lava that hardens on Earth's surface - It is a type of Igneous rock.
A mass of Igneous rock that was formed by cooled magma under the Earth's surface.
A gap in the geological record - it shows where some rock layers have been lost because of erosion.
A fault or intrusion is younger than the rocks that it cuts through.
We know that something must exist before something else can cut through it.
The process that breaks down rock or other substances.
- physically breaking rocks into smaller pieces
-breaking down rocks through a chemical change
The process by which natural forces move weathered rock and soil from one place to another.
Sedimentary rock or igneous rock through heat and pressure becomes metamorphic rock. Metamorphic rock melts into magma, but then cools into igneous rock.
All three types of rock can weather into sediment
Sediment then through compaction and cementation become sedimentary rock.
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