Geological_processes_core_topic_10_summary_sheets.doc - The...

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The theory of plate tectonics The outer layer of the Earth’s crust – the Lithosphere is not a continuous structure but is split a little like the cracked shell on a hard boiled egg: The result is a series of plates floating on the hot mantle beneath. Heat in the mantle creates convection currents that cause the plates to move . Plate margins exist where the plates meet . The history of the Earth’s plates – see also The beginning of time
Map – plates and continents of the World – today.
Plate Margins – where plates meet Earthquakes and volcanoes (evidence of unrest in the Earth), help locate the edges of plates known as plate margins or boundaries. Take for example the ‘Ring of Fire’ around the Pacific. Volcano’s can be joined together using a ‘dot to dot’ technique. The pattern that follows exactly matches known plate margins.
Different types of plate margin and how they contribute to the formation and deformation of rocks. As plates move; they can push together or move apart. 1. Moving apart – CONSTRUCTIVE , e.g. Atlantic mid- ocean ridge.
The floor of the Atlantic Ocean is widening as plates are moving apart.

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