Oceanic Oceanic Convergent Boundary

Name 2 oceanic plates that are moving towards each other

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The South American Plate is moving westwards due to sea floor spreading at the Mid Atlantic Ridge. Where it meets the Caribbean Plate, it descends (________) beneath it.

subduction causes low density ocean floor sediment to be ​ (a)   off the surface of the South American Plate and thrust onto the Caribbean Islands as ​ (b)   wedges, in a process called ​ (c)   . The line of subduction is marked by the deep sea Puerto Rico ​ (d)  

• scraped
• accretionary
• obduction
• Trench

As the ​ (a)   descends, it drags against the overlying plate, causing both to fracture and deform. This results in frequent ​ (b)   focus earthquakes that get deeper as the ocean plate descends further, defining a zone of earthquake foci known as a ​ (c)   zone.

• shallow
• superficial
• surface
• minor
• Benioff
• Obduction
• Milankovitch
• South American Plate
• Caribbean
• less dense

What is the name of the magma produced at an oceanic-oceanic convergent boundary?

• basalmic

• andesitic

• rhyolitic

• basaltic

What happens to the melting point of the plate as it descends into the mantle?

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Andesitic magma is less dense than the surrounding material, and can have a temperature of ​ (a)   . It is ​ (b)   , trapping gases as it rises. The water and gases in andesitic magma account for the ​ (c)   activity of andesitic volcanoes, which typically lie ​ (d)   for many hundreds or thousands of years. These volcanoes typically produce ash and ​ (e)   flows, as well as small amounts of andesitic lava.

• 1000oC
• viscous
• dormant
• pyroclastic
• explosive

Name a volcano and volcanic island arch found at a convergent oceanic oceanic plate boundary

• Ben Nevis

• Caribbean Islands

• Montserrat

• The Phillipines

• Mount Vesuvious