geology of the oceans n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Geology of the Oceans PowerPoint Presentation
Download Presentation
Geology of the Oceans

Loading in 2 Seconds...

play fullscreen
1 / 17

Geology of the Oceans - PowerPoint PPT Presentation


  • 83 Views
  • Uploaded on

Geology of the Oceans. Did we always have oceans?_____. Have they changed ?___________ Oceans formed between 4.2-3.8 billion years ago Water vapor escaping from crust condensed on surface http://www.youtube.com/watch?v=hwVU0-2Qnso&safety_mode=true&persist_safety_mode=1.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Geology of the Oceans' - senona


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
did we always have oceans
Did we always have oceans?_____
  • Have they changed ?___________
  • Oceans formed between 4.2-3.8 billion years ago
    • Water vapor escaping from crust condensed on surface
    • http://www.youtube.com/watch?v=hwVU0-2Qnso&safety_mode=true&persist_safety_mode=1
after the ocean formation
After the ocean formation
  • 3.6 billion years of simple cells (prokaryotes)
  • 3.4 billion years of stromatolites demonstrating photosynthesis,

SNOWBALL EARTH

  • 2 billion years of complex cells (eukaryotes)
  • 1 billion years of multicellular life,
continental drift creation of oceans
Continental Drift: Creation of oceans

Do oceans change?___ how?_____________

___________________

world ocean
World Ocean
  • Covers 70.8% of Earth’s surface
  • Four main basins—Pacific, Indian, Atlantic, Arctic
  • 1. Which ocean is the largest?_______
  • 2. Which ocean is between North America and Europe?________
  • 3. Which ocean is

Bordered by Africa,

Australia, India?

______________

geology of the oceans1
Geology of the Oceans
  • Continental crust vs. Oceanic crust: What is the difference?_______________________
continental drift
Continental Drift
  • Magma & convection currents

drive continental movement

  • Erupting magma
    • Midocean ridges
    • ridge systems
  • Subduction zones:
  • __________________
  • Seafloor spreading:
  • __________________
ocean basin
Ocean Basin
  • Abyssal Plains and Hills
  • Seamounts
  • Ridges and Rises
  • Trenches
    • Island arcs
    • Marianna Trench
evidence for continental drift
Evidence for Continental Drift
  • Fit of the continental boundaries
  • Distribution of earthquakes
  • Temperature of the sea bottom
  • Age of rock samples from the seafloor: young/old
  • Analysis of core samples drilled through the ocean sediments.
rift communities
Rift Communities
  • Rift communities, or deep-sea vent communities
  • 1977
  • Food webs in

absence of sunlight

composition of sea floor
Composition of Sea Floor
  • Hydrogenous Sediment
  • Biogenous Sediment
    • Calcareous ooze
    • Siliceous ooze (glass)
  • Terrigenous Sediment
    • mud
  • Cosmogenous Sediment
    • Iron rich
aliens of the deep
Aliens of the deep
  • Watch the video and list any organisms that you can identify and what criteria you used to identify them.