science

What are rock strata?

• stacked up layers of meatamorphic rock

•  Stacked up layers of sedimentary rock

• earths history

• fossil

 What is stratigraphy?

• a fossil of an organism that lived over a wide span area for a short period of geologic time and so can be used to date the rock layers in which it occurs 

• The analysis of the order and position of layers of archaeological remains

• The process of determining the approximate age of a rock, fossil, or event

• a model of Earth's history divided into eons eras periods and epochs

How are relative and absolute dating used

• a fossil of an organism that lived over a wide span area for a short period of geologic time and so can be used to date the rock layers in which it occurs 

  
  

• determining the order in which events and Earth's history occurred

• To find the specific age of an object, archaeologists use absolute dating.

• States that in undistributed rock layers, the oldest rock is at the bottom and the youngest rock is at the top

How are index fossils used

• as guides to the age of the rocks in which they are preserved.

• undistributed rock layers, the oldest rock is at the bottom and the youngest rock is at the top

• a model of Earth's history divided into eons eras periods and epochs

• The analysis of the order and position of layers of archaeological remains

what are index fossils charitersitics

• determining the order in which events and Earth's history occurred

  
  

• very hot heat and pressure 

• distinctive or easily recognizable, abundant, and have a wide geographic distribution and a short range through time.

• Made of dirt and broken up rock

law of superposition

• States that in undistributed rock layers, the oldest rock is at the bottom and the youngest rock is at the top

• When a bunch of life forms die at once

• a model of Earth's history divided into eons eras periods and epochs

• When the world was created from right now 

What is mass extinction

• When the world was created from right now

• When a bunch of life forms die at once 

•  very hot heat and pressure 

• The process of determining the order in which events and Earth's history occurred

What is a geologic time scale

• a model of Earth's history divided into eons eras periods and epochs

•  When a bunch of life forms die at once 

• The process of determining the order in which events and Earth's history occurred

• The process of determining the approximate age of a rock, fossil, or event