1.4 competed + examples

Question 1

o-o divergence with example

Answer 1

• two oceanic plates diverge due to convection current, tensions force is exerted
  • decrease in overlying pressure causes parts of the mantle to melt, forming magma
  • magma rises to fill the gaps in the weak areas in the plates as they diverge. lava cools, solidifies to form new oceanic crust through seafloor spreading
  • overtime, a linear ridge,known as the mid oceanic ridge, forms, which is an underwater mountain chain that divides the ocean in half
  • at the centre of the ridge is a deep rift valley with steep sides
  • magma may also rise through the weak areas in the oceanic plate, cool and accumulate to form submarine volcanoes. with more magma overtime, the volcano can grow above sea level, forming volcanic islands
  • earthquakes also occur here due to stress and tension released when plates diverge

Question 2

o-o divergence examples

Answer 2

• two oceanic plates: north america and eurasian plate
• mid oceanic ridge: mid atlantic ridge
• rift valley
• undersea volcano / volcanic islands: iceland
• weak earthquakes

Question 3

c-c divergence with examples

Answer 3

• two continental plates to diverge due to convection current, tensional force is exerted
• the continental crust is stretched thin, the rocks eventually fracture to form parallel faults
• overtime, the rocks in between these faults sinks to form a rift valley with steep sides
• as divergence continues, decrease in overlying pressure causes parts of the mantle to melt, forming magma
• magma rises to fill the gaps in the weak areas on the plates as they move apart to form volcanos
• earthquakes also occur here due to stress and tension released when plates diverge

Question 4

c-c divergence example

Answer 4

two continental plates: nubian & somalian plate rift valley: great east african rift valley volcano: mount kenya weak earthquakes

Question 5

o-o convergence with example

Answer 5

• sinking convection currents in the mantle causes two oceanic plates to converge and collide due to cimroessional force
• the denser oceanic plate would subduct beneath the less dense oceanic plate
• this forms a deep linear depression known as a oceanic trench at the point of subduction
• the subducted oceanic plate sinks into the mantle and the high-pressure forces water out of the oceanic crust. water lowers the melting point of the overlying mantle, causing it to melt, forming magma
• magma rises to fill the gaps in the weak areas in the plates to form submarine volcanoes. after multiple eruptions, they may rise above the surface of water, forming volcanic islands
• earthquakes can also occur as friction is create when one plate subdu to under another plate

Question 6

o-o convergence example

Answer 6

two oceanic plates: philippine and pacific plates deep oceanic trench: mariana trench undersea volcano/ volcanic islands: mariana trench strong earthquake

Question 7

o-c convergence example

Answer 7

one continental plate: south america plate one oceanic plate: nazca plate deep oceanic trench: peru-chile trench fold mountains: andes mountain
volcano: cotopaxi
strong earthquakes: 2010 chile earthquakes

Question 8

transform with example

Answer 8

2 plates: pacific and north american
transform fault: san andreas fault
strong earthquake: 1989 loma prieta eq

Question 9

transform with example

Answer 9

• two plates move sideways against each other along a transform plate boundary, no crust is created or destroyed
• stress caused by thus movement creates a fault, which is a zone of fractures
• when the rocks can no longer withstand the pressure,the plates may suddenly slip, resulting in earthquakes

Question 10

transform example

Answer 10

two plates: pacific plates and north american plate transform fault: san andreas fault
strong earthquakes: 1989 loma prieta earthquake

Question 11

o-c convergence with example

Answer 11

sinking convection currents in the mantle causes one oceanic and one continental plate to converge and collide due to compressional force
• the denser oceanic plate subducts under the less dense continental plate
• thus firms a deep linear depression known as a oceanic trench at the point of subduction
• the subducted oceanic plate sinks into the mantle and the high pressure forces water out of the oceanic crust. water lowers the melting point of the overlying mantle, causing it to melt, forming magma
• magma rises to fill the gaps in the weak areas in the plates to form volcanos on the continental plate
-enormous pressure causes the edges of the continental plate to be uplifted and buckled to form fold mountains
• earthquakes can also occur as friction is created when one plate subducts under another plate

Question 12

c-c convergence with examples

Answer 12

• sinking convection currents in the mantle causes two continental plates to converge and collide due to compressional force
• both continental plates are light and buoyant, hence both plates would not subduct
• enormous pressure causes the edges of the plates to be uplifted and buckled to form, fold mountains
• earthquakes can also occur as friction is created when two plates collide

Question 13

c-c convergence examples

Answer 13

two continental plates: indian and eurasian plate fold mountains: himalayan mountains strong earthquakes: 2015 nepal earthquakes