Introduction to tectonics w/c 15h March

Which layer of the Earth is made from liquid iron and nickel and is between 3,500-4,000°C?

• Inner core

• Outer core

• Mantle

• Upper mantle

What is the Mohorovocic Discontinuity?

• The boundary between the crust and upper mantle

• The boundary between the upper mantle and mantle

• The boundary between the mantle and inner core

• The boundary between the lithosphere and the asthenosphere

What is the oceanic crust made of?

• Basalt

• Dolerite

• Granite

• Limestone

Which is the most dense type of crust?

• Oceanic

• Continental

Subduction is...

• the action or process in plate tectonics of the edge of one crustal plate descending below the edge of another

• the process by which oceanic crust moves along a transform fault

• the action or process in plate tectonics where the boundary between two tectonic plates are spread apart

• this is a depth where seismic waves change velocity and there is also a change in chemical composition

Which type of crust is more buoyant?

• Oceanic

• Continental

Which plate lies directly west of the South American plate?

• Nazca plate

• Scotia plate

• Pacific plate

• Juan de Fuca plate

Which two plates are responsible for the formation of the Mid-Atlantic ridge? Tick two.

• Eurasian plate

• Pacific plate

• North American plate

• Indo-Australian plate

___________ ____________, that occur within the molten rock in the mantle, act like a conveyor belt for the plates.

Explain what a convection current is in detail.