6 Questions Compare the Earth of today to that of 250 million years ago. Describ
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6 QuestionsCompare 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 and 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. 6 Questions
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 and 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. 6 Questions
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 and 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.
Explanation / Answer
250 Myr is roughly the boundary of Paleozoic and Mesozoic. The supercontinent Pangea existed at that time. Pangea formed at around 335 Myr ago and it started to break apart at around 175 Myr ago. Over time the continents have changed from one single landmass to their present positions. Pangea broke up into the fragments which are the continents today.
Magnetic striping is the process of preservation of earth's magnetic field in the rock record when a new oceanic crust forms at the mid-oceanic ridge due to cooling. When the magnetic minerals like magnetite etc cool below the Curie temperature they preserve the present magnetic field of the earth. Polar reversals are the phenomenon in which the direction of magnetic field of earth reverses. There are records of polar reversals preserved in the oceanic rocks till 160 Myr.
Subduction is the process in which the denser tectonic plate (oceanic plate) subducts below the less dense continental or oceanic plate. There can be ocean-ocean plate subduction or ocean-continental plate subduction. Example of currently active subduction zones are: 1. Mariana trench (Ocean-Ocean subduction) where Pacific plate is being subducted below Phillipines plate. 2. Andes Mountain range in South America where Nazca plate is subducting below the South American plate.
Divergent boundaries are the boundaries where two tectonic plates move apart from each other. When two plates diverge they result in the formation of a new crust. Example: Mid Atlantic Ridge in the Atlantic ocean.
Transform boundaries are the boundaries where two plates slide past each other. There is no significant converging or diverging movement between the plates. The most famous example of a transform boundary is the San Andreas fault.
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