Published on February 6, 2008
Global Distribution of Volcanoes
Global Distribution of Earthquakes
Tectonic Plates > Plate Boundaries
If we can provide proof that Pangaea existed – what else can we prove?
The Future ...
What is the evidence that Pangaea existed? 1. Geological Evidence 2. Biological Evidence 3. Climate Evidence
1. Geological Evidence
Fit of South America and Africa
The continents of South America and Africa look like they should fit together like a jig- saw puzzle. There are patterns in the structure of the mountains in North East USA and North West Europe that would suggest they should join together.
2. Biological Evidence
Could Mesosaurus have swum from South America to Africa? Researchers say no.
The fossils of Mesosaurus has been found in both South America and Africa. Looking at the skeleton of Mesosaurus tells us that it could not have swam from one continent to the other therefore the continents, at one time, must have been closer.
3. Climate Evidence
Coal Think about the climate in which coal forming vegetation grows.
Limestone > Coral
Limestone is found France and the UK > Must have been located in a warmer region of the world.
So what are the mechanisms that makes this happen? Sea Floor Spreading
Plates are like rafts ‘floating’ onto top of the mantle.
We know about the structure of the earth from the study of the behavior of waves as they pass through the earth.
Exploring the Ocean Floor
Ranges of submarine mountains in the middle of the Atlantic.
The crust gets older with distance from the Mid-Oceanic Ridge. There are strips of crust that show alternating polarity.
Convection currents in the mantle.
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