Volcano - An opening in a planet's crust through which lava, ash, rock and gases  erupt from a  magma chamber., Divergent plate boundary - The tectonic plates move apart., Trenches - This ocean form is created when the more dense plate is pushed beneath the other plate., How do mid ocean ridges form? - Magma rises up between two diverging tectonic plates. When it hardens into rock, it creates new seafloor., Crust - The outer layer of the earth that is made of solid rock (thinner in the ocean and thicker at land or mountains).  , Convergent plate boundary - The tectonic plates are moving towards each other., Subduction plate boundary - Trenches are formed in this plate boundary. ,

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