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Canada UNIT 2: Physical diversity

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Canada UNIT 2: Physical diversity Chapter 4: Geologic History Geological History Our physical appearance has changed over time. Land is being built up. – PowerPoint PPT presentation

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Title: Canada UNIT 2: Physical diversity


1
Canada UNIT 2 Physical diversity
  • Chapter 4 Geologic History

2
Geological History
  • Our physical appearance has changed over time.
  • Land is being built up. HOW?
  • Volcanoes
  • Moving plates
  • Deposition
  • Land being worn away. HOW? (Erosion)
  • Rain, rivers and oceans
  • Wind
  • Glaciers
  • Ex. Ancient seas have disappeared.
  • Mountains that were once high are now worn
    flat.
  • Pages 26-27

3
Geologic History
  • Many years ago Canadas landscape looked very
    different from how it looks today.
  • Two forces have mainly changed the physical
    landscape.
  • Erosion and Mountain building.
  • One being stronger than the other.
  • Q. How have things changed over time?

4
Geologic History
  • Geologic time history of how the earth has
    changed from its formation to the present.
  • Earth is approx. 4.6 billion years old.
  • Earths geologic history can be divided into 4
    eras (time periods).
  • Cenozoic
  • Mesozoic
  • Paleozoic
  • Precambrian

5
Geologic History
  • Each era represents a time of major sediment
    deposition and earth movement.
  • In other words, significant building up, wearing
    down and movement of the land.

6
Precambrian Era
  • Refers to earliest life and is the oldest!!!
  • 4.6 billion to 600 million years ago.
  • Lasted over 4 billion years.
  • Many cycles of building and wearing down
    (EROSION).
  • Our continent and in particular, the Canadian
    Shield was formed during this era.
  • Primitive life forms such as single-celled plants
    and animals.
  • Pages 28 - 29

7
The Canadian Shield
8
Paleozoic Era
  • refers to ancient life
  • 600 to 225 million years ago (lasted 375 million
    years).
  • More mountain building, but lots of erosion of
    the Canadian Shield as well.
  • Erosion produced sediments which are small
    particle of rock that have been worn down.
  • These sediments were moved about by rivers and
    deposited elsewhere.

9
Paleozoic Era
  • Layers of sediments were compressed together to
    form sedimentary rock.
  • They have become the bedrock (underlying solid
    rock beneath the layer of soil) in every
    province.
  • Appalachian mountains in Eastern Canada formed
    (p. 30) when these layers of sedimentary rock
    were forced UPWARDS.?

10
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11
The Appalachians
12
Formation of the Appalachians
13
Mesozoic
  • Refers to the Middle life.
  • 225 to 70 million years ago
  • Innuitian mountains formed when eastern Arctic
    FOLDED
  • Rocky Mountains in Western Canada started to form
    (at the end).

14
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15
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16
Mesozoic Formation of fuel deposits
  • (page 31-top)
  • Warm climate
  • swamps and forests
  • Dead trees Vegetation
  • Swamps, sand silt
  • Compressed layers
  • Coal, oil and gas deposits formed

17
Cenozoic
  • Refers to recent life.
  • 70 million years ago to now (has not ended).
  • More mountain building through folding, volcanoes
    and faulting.
  • Glaciers were the most significant force in
    shaping the land during this era and especially
    Canada as we know it today!!
  • They eroded and rounded the Canadian Shield and
    Appalachian Mountains.

18
Cenozoic
  • Once melted, they deposited the eroded material
    to create the lowlands surrounding the Canadian
    Shield.
  • Some are still present today in Canada.
  • Age of mammals (including humans!)
  • Great Lakes - St. Lawrence Lowlands
  • Hudson Bay - Arctic Lowlands
  • Interior Plains

19
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20
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21
Questions - Review
  • Page 32
  • 1 ( 1 Pt)
  • 2a (2 Pts)
  • 2b ( 3 Pts)
  • 3a ( 1 Pt)
  • 4a ( 1 Pt)
  • 4b ( 1 Pt)
  • 4c ( 1 Pt)
  • 4d ( 1 Pt)
  • Page 32
  • 5b ( 1 Pt)
  • 6a ( 1 Pt)
  • 6b ( 1 Pt)
  • 7a ( 1 Pt)
  • 7b ( 1 Pt)
  • 7c ( 1 Pt)
  • 7d ( 1 Pt)
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