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1. Briefly explain how low-density continental crust was produced from earths rocky mantle. 2. Describe how cratons came into being. 3. What is the supercontinent cycle? What supercontinent proceeded Pangaea? 4. Give an example of how the movement of a continent can trigger climate change. 22.5. 1.
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Feb 15, 2018 · 4.Briefly describe each of the following vocabulary terms in your own words: style, tone, diction, syntax. Style: how you formulate and convey your words when you write. Tone: How you explain and read your work. Diction: How you set your writing. Syntax: arrangement or choice of words 5.The unit discusses seven tips that help to cultivate ...
Cratons are pieces of continents that have been stable for a over a billion years . As earth’s plates drift along, mountains periodically rise and fall, plate boundaries appear and disappear. But cratons are like great-grandmothers at family gatherings, while younger crust moves excitedly around them, they sit quietly, ...
Posted on 19 December, 2012 by Metageologist. Cratons are pieces of continents that have been stable for a over a billion years. As earth’s plates drift along, mountains periodically rise and fall, plate boundaries appear and disappear. But cratons are like great-grandmothers at family gatherings, while younger crust moves excitedly around them, ...
Every continent has cratonic areas, notably the core of North America, Scandinavia, Siberia, India and most of Australia.
Cratonic crust is strong, being unusually cold and dry, but that is only part of the picture. Continental crust is the upper portion of continental lithosphere. It’s lithosphere that puts the plates into plate tectonics, it’s a rigid layer on the earth’s surface, as opposed to the hot flowing mantle that lies beneath (the asthenosphere).
Every continent has cratonic areas, notably the core of North America, Scandinavia, Siberia, India and most of Australia. They may be covered by a thin shawl of sediment, but often they expose ‘basement’ rocks such as gneiss.
Cratons are anomalously-strong regions of the continents that have largely resisted tectonic forces for billions of years. How such strong zones could be forged in a hot, low-viscosity, low stress, early-Earth has been a long-standing puzzle for geologists. Adam Beall, Katie Cooper and I have recently proposed that cratons were made by ...
The continental crust is generally a great deal weaker and can crumple or stretch in response to movements of the oceanic plates forming mountain belts, rifts and low-lying basins. Some of the oldest parts of the continental crust are an exception to this generalisation.
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