Continental drift
What is continental drift
The movement of the continents
What is the top layer of the Earth
What is needed for a convection current to occur
a liquid and a heat source
What is a plate
A chunk of the earth's crust that floats in the mantle
What is the main seafloor spreading boundary
the mid atlantic ridge
What causes continents to drift
convection currents in the mantle and seafloor spreading
Which layer is mostly made of magma
Mantle
Where do convection currents occur in the Earth
What is a plate boundary
where two plates meet
What is made during seafloor spreading?
New ocean floor bubbles out of a volcano
Which ocean is getting smaller? Which ocean is getting bigger?
pacific is shrinking while atlantic is growing
What is the only liquid layer
The outer core
What is the heat source for convection currents in the mantle
THe core
What happens at a divergent boundary?
Plates move apart. Small volcanoes Shield
What type of boundary is responsible for seafloor spreading?
Divergent
Which usa coastline will hit asia when the continents come back together?
California/west coast
Iron and nickel
What do convection currents cause on the surface
Plate boundaries and continental drift
plates collide. Mountains or volcanoes composite.
What is the name of the area where older ocean floor goes back into the mantle?
subduction zone
Name at least 2 of the 4 pieces of evidence for continental drift
Mathching fossils on multiple continents
Mathcing land features on multiple continents
continents are like puzzle pieces
glacial evidence on places that are hot
Why is the inner core solid?
The intense pressure does not allow the atoms to move even though they are hot enough to.
Will convection currents in the mantle ever stop
only if the core cools down so no
What happens at a transform boundary
Plate move side to side. Faults or earthquakes
how does seafloor spreading cause continental drift
The new crust being made pushes other crust to either side of it causing the continents to move