Oceanic crust is often made of ____ which has a different chemical composition. When it ____ with continental crust, the denser ____ plate starts to sink downwards (____). The ____ of cold, denser crust sinking into the ____ creates an ocean ____ - pulling the ocean downwards behind it through ____-____. The crust is destroyed as it melts. (Underwater) ____ erupt as magma rises through the crust because a magma chamber has been ____ because of an earthquake. The magma chamber is there because crust has melted in over a long period of time. As the plates ____, ____ creates mountains as two continental plates ____, force land ____, and subduction causes the crust to buckle under pressure. Folded land creates many ____ slopes that can be vulnerable to ____. Earthquakes also happen in the ____ zone because of the build up, and then release, of friction as the plates move past each other. 

Tectonics L9 - Destructive Margins Cloze

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