What is Sea Floor Spreading?
Who discovered sea-floor spreading?
Harry Hess
What is Sonar?
Sound navigation and ranging
What is another word for subduction?
Convergent plate boundary
What is a subduction zone?
Plate movement
The mantle
What cause sea-floor spreading?
Volcanic activity
What is the mid-ocean ridge?
Seafloor mountain system formed by plate tectonics
Continental and oceanic plates
What happens when there is subduction?
2 plates converge and one plate goes beneth the other
What layer of the eath causes sea floor spreading?
The mantle
Where does sea-floor spreading occur?
Mid-ocean ridges
What is the most famous mid-ocean ridge?
Mid-Atlantic Ridge
What is sonar used for?
Measuring depths of the ocean
What is the cause of sea-floor spreading?
Magma and heat from the mantles convection currents
What 2 parts/ layers of the earth cause subduction?
Mantle and lithosphere
What plates created sea-floor spreading?
How is the mid-ocean ridge created?
Magma rises and hardens as it pushes divergent plates apart
If 2 oceanic plates hit each other, which one would slide under?
The more dense plate
What are the natual causes of subduction?
Eathquakes, tsunamis, landslides and volcanic eruptions
Where on earth is sea floor spreading much more rapidly?
The Pacific Ocean
How did harry Hess discover sea-floor spreading?
Sonar
Where does the mid-ocean ridge rise above the earths surface?
Iceland
Which plate would slide under the two plates, continental or oceanic?
What happens when there is sea-floor spreading?
The divergent plates spread and magma come through from the mantle to harden and make a new crust
Which area of the ridge has the slowest sea floor spreading?
Mid atlantic ridge