Compare the Earth of today to that of 250 million years ago. Describe a few exam

Question

Compare the Earth of today to that of 250 million years ago. Describe a few examples of how the continents have changed over time. Describe the processes of magnetic striping aned polar reversals. With respect to plate tectonics, what is subduction? Provide and describe an example of a current subduction zone With respect to plate tectonics, what are divergent boundaries? Provide and describe an example of a current divergent boundary. With respect to plate tectonics, what are transform boundaries? Provide and describe an example of a current transform boundary. Find and explore evidence that explains how the plates have moved over time. Gather evidence from the perspectives of sea floor spreading, fossils and volcanic/earthquake activity. Feel free to evidence. Make sure you remember to cite all your sources as you compile the evidence. create a table listing the categories a nd

Explanation / Answer

1)- Mesozoic era begins at around 250 million years ago, at that time there was only one continent that is known as the supercontinent Pangea which contains the today’s all continents in a one supercontinent and this big continent is surrounded by the large ocean namely Panthalassa, in the mid Mesozoic era this supercontinent began to break because of the movement of the convection cell in the mantle and thus gradually it separated the today’s continents in which we r living now.

2)-

There was the regular changing in the geomagnetic polar locations from time to time because the magnetic poles were in the wandering and thus it causes reversal in magnetic fields. This era wise change in magnetic field also affects or got recorded in the minerals of the outpouring ridges of the mid oceanic ridges, this the basaltic lava forms alternate strips with alternate magnetic moment these strips are known as the Zebra Stripping, and these are the basis of the study of paleo magnetism and the reversal of magnetic pattern or polarity

3)-

Subduction is a process in which at the time of the convergence of tectonic plates, one plate which is heavier goes under the other plate which is relatively lighter, this process accompanied with the evolution or forming of volcanic arcs or island arcs. Convergence can be between oceanic- oceanic plate which forms island arcs such as Philippines archipelago, Indonesian archipelago etc , between oceanic- continental plates these forms volcanic mountain ranges such as Andes Range , Rockies range etc

4)-

It is a boundary along which two tectonic plates moves apart due to motion of the convection cell inside the mantle because of this apart movement or spreading movement the crust just above the moving convection cell becomes thinned and eventually led to the formation of the Rift Valley , oceanic ridges, nascent sea etc , there are 2 types of plate interactions along the divergent boundary, the one is oceanic- oceanic plate divergence causes formation of ridges eg is Mid oceanic ridge , the another one is the continental- continental plate divergence forms Rift Valley such as great African Rift Valley

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