Divergent Plate boundaries (features)

• _____ jets of water that re-emerge onto the ___ ____ containing ___ _____, these are known as ___ ____, and they support ___ ____ ____?

  superheated, ocean floor, metal sulphides, black smoker, highly specialised organisms
• rift valleys form due to ___ _____, the ____ stretches , ____ and the land ___ ____ into deep ___ valleys separated by ____?

  continental divergence, lithosphere, fractures, collapses inwards, wide, horsts
• horsts are ___ ___ of land ?

  raised blocks
• at a divergent plate boundary, plates ___ ___, and magma ___ ____ through the ____ to the _____ and this happens mostly ____, resulting in ___ _____ which is when magma cools ____ at the sea ___?

  move apart, rises up, asthenosphere, surface, underwater, pillow lava, rapidly, bed
• as magma rises, ___ _____ and _____ forcing ____ ___ upwards to fracture forming underwater ___ ____, these can be found at ____ ____ separated by ____ of kilometers?

  pressure reduces, liquifies, overlying rock, rift valleys, different locations, thousands
• at slow ___ boundaries, two plates spread about _ to _ cm per year, forming ___ ___ to mountain chains and ___ ___ central rift valleys, one example of this is the ___ ___ ___?

  spreading, 2,3, steep slopes, clearly defined, Mid Atlantic Ridge
• at fast ___ boundaries, the two plates are moving apart up to __._ cm per year, they form ___, ___ mountain chains, and __ central ___ ____, one example of this is the __ __ ____?

  spreading, 16.5, broad, smooth, no, rift valleys, east pacific rise
• medium _____ boundaries spread _ to __ cm per year, they form ___ ___ central rift valleys, and ____ ____ mountain chains, one example of this is the ___ _____?

  spreading, 5,10, poorly defined, relatively smooth, Galapagos ridge
• in Indonesia, there are ___ active volcanoes, specifically ___ ___ along it's archipelago?

  130, strato volcanoes
• icelandic volcanoes consist of ___ -____, shield volcanoes and _____?

  strato-volcanoes, fissures
• LIP (___ ___ ____) is created by ___ ____ that extended ___,___ km squared?

  Large Igneous Province, flood basalts, 500,000
• Calderas are ___ ____ that are usually larger than ___ in _____, they develop when an ____ eruption destroys the ____ and ___ ___ ____ is emptied?

  volcanic craters, 2km, diameter, explosive, cone, underlying magma chamber
• the ____ eruption of ____ in Indonesia left a ___ that was _ km wide?

  1883, Krakatoa, caldera, 7