Geological Time Student Notes - Unit 9 Geological Time

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					Unit 9 Geological Time
Unit 9 Title Page

  • Geological Time – Unit 9
  • Earth Space Science
  • 6th grade
Essential Questions:

How do scientists determine
 the age of rocks and fossils?
 How do humans affect change
 on earth?
Essential Questions:

How do scientists determine
 the age of rocks and fossils?
 How do humans affect
 change on earth?
Essential Questions

How do scientists determine
 the age of rocks and fossils?
 How do humans affect change
 on earth?
Sunshine State Standards

Describe and give examples of
ways in which Earth's surface is
build up and torn down by physical
and chemical weathering, erosion,
and deposition.
Sunshine State Standards

  Identify the impact that
  humans have had on Earth
  such as deforestation,
  desertification, erosion, air
  and water.
Sunshine State Standards

Identify current
methods for measuring the
age of the Earth and its parts
including the law of
superposition and radioactive
Sunshine State Standards

  Explain and give
  examples on how physical
  evidence supports scientific
  theories that the Earth has
  evolved over geologic time
  due to natural processes.
Sunshine State Standards

  • SC7.E.6.7
  Recognize the heat flow and
  movement of the earth
  causes earthquakes, volcanic
  eruptions, and creates
  mountains over basins.
      Earth’s History

1. How old is 1. 4,600,000,000
the earth?    years (give or
         Earth’s History

2. What is 2. A time scale of
Geologic the history of the
Time?      earth and life on
         Earth’s History

3. What are    3.
the theories   A collapsing cloud of
               dust became the solar
about earth    system
forming?       Earth was one of several
               clumps of stuff that
                The biggest clump
               became the sun
         Earth’s History
4. Describe     A. The surface was hot with no
earth’s early   oceans

history.        B. Gasses from volcanoes formed
                an atmosphere

                C. Some gasses cooled to form
                liquids and a worldwide ocean

                D. 3,800,000,000 years ago, small
                   landmasses formed in the

                E. Life started in the oceans
          Life on Earth
5. What is a    Fossils are remains or evidence of an
fossil?         organism that lived in the past
                Usually an organism that had been
                buried in sediments

                Could be footprints, imprints,
                petrified, etc.

                Used to show how organisms have
                changed over time
          Earth’s History
6. Describe life   The earth began to settle down
on earth 2         from its rumbling, destructive
million years      • Changes happened more
                   slowly since then
ago.               • Processes of Change
                          a) Weathering – rocks are
                   broken down into smaller particles
                          b) Erosion – small rock particles
                   are carried away by wind, water, ice,
                   gravity, etc.
                          c) Deposition – buildup of
                   sediment in low places
                          d) Uplift – parts of the earth are
                   pushed up to form mountains or
     Geological Time Scale

7. What does     7. The rocks contain records
                 of geological time.
   it mean, “    Geologic time is divided
   record in     into stages based on
   the rocks?”   important changes of the
                 rocks. The layers of
                 sedimentary rock contain
     Geological Time Scale

8. What is      8. Relative age is the age of
                rocks determined by
relative age?   position of the layers.
       Geological Time Scale
9. What is the   9. The principle of superposition
principle of     states that the younger layers of rock
superposition?   form layers on top of older rocks.
                 Unconformity, or a line between rock
                 layers that show a break in geological
                 time does occur. Rock layers are
                 horizontal before they deform; faults
                 and igneous intrusions are younger
                 than layers they cut across.
    Geological Time Scale

9A: Sketch
     Geological Time Scale
10.What is   10. Absolute Age is an approximate
             age in years of a rock as determined
absolute     by radiometric dating
age?         • isotopes decay into more stable
             • half-life – time it takes for half of a
             sample to decay
Divisions of Geological Time Scale
11. What is   11. Eras are one of the larger units of
              geologic time ( eons are the largest)
  an era?      Include 4 major divisions:
              Precambrian, Paleozoic, Mesozoic,
              and Cenozoic
Divisions of Geological Time Scale
12. What is   12. A period of time is a
  a period    subdivision of a
  of time?
              geological era; based
              upon types of life
Divisions of Geological Time Scale
13. What is     An epoch is a
  epoch?      subdivision of a
              geological time
The Eras: Geological Time Scale
14. The       14.
              •4,600 to 640 million years ago
Precambrian   • began with the formation of
Era.          the earth
              • Cyanbacteria – one of the oldest life
              forms on Earth which first appeared
              3,500 million years ago; began to
              release oxygen into the atmosphere.
              • first many-celled organisms over
              1,000 million years ago
              Paleozoic Era

                15. Paleozoic Era – 640 to 245
15. Describe    million years ago
  the           • First animals with backbones in
  Paleozoic     oceans
  era.          • Simple plants on land
                about 430 million years ago
                 arthropods (bugs) on land about
                400 million years ago
                • Ended with a mass extinction
      The Mesozoic Era

16.         16. Mesozoic Era –   245 to 66
            million years ago
 Describe   • dinosaurs and flowering
 the        plants
 Mesozoic   • most of earth was warm &
 Era        wet
            • ended with a mass
           The Cenozoic Era

17. Describe the
     Cenozoic Era?
                     17. Cenozoic Era –
                     66 million years ago to now
                     • mammals began to take
                     • cooler and drier
                     • several ice ages
                     • ends with ?

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