Earths Layers
Plate Tectonics
Plate boundaries
Sea floor Spreading
Previous Units
100

The outermost and thinnest layer of the Earth

Crust

100

This layer of the Earth is broken into pieces called tectonic plates

lithosphere

100

the plate boundary where 2 plates collide with each other

convergent boundary

100

The type of plate boundary that creates new oceanic crust

divergent boundary

100

Newly formed oceanic crust occurs at which type of plate boundary?

what is a divergent 

200

The thickest layer of the Earth located between the crust and the outer core

mantle

200

The 2 types of tectonic plates are

oceanic and continental

200

The plate boundary where 2 plates slide past each other

transform boundary

200

The process of new oceanic crust forming is

sea-floor spreading

200

What type of boundary occurs where two plates move together, causing one plate to descend into the mantle beneath the other plate?



what is convergent boundary 

300

The third layer of the Earth made of liquid metal

outer core

300

Located in the athenosphere these move the tectonic plates

convection currents

300

The plate boundary where 2 plates pull apart from each other

divergent boundary

300
a chain of under water mountains is known as a 

mid ocean ridge

300

a current caused by the rising of heated fluid and sinking of cooled fluid

convection current 

400

The densest layer made of solid metals such as nickel and iron

inner core

400

Plate tectonics provided evidence to support what theory that could not be explained before

Continental Drift

400

The plate boundary where mountains are formed

convergent boundary

400

Underwater volcanos will sometimes create large waves that are known as 

tsunamis 

400

the scientific results that support a theory are 

evidence

500

The layer of the Earth that contains the crust and uppermost part of the mantle

lithosphere

500

Plate tectonics cause changes to the geological features of the Earth. True or False

True

500

The plate boundary such as the San Andreas Fault in California that often produces Earthquakes

transform boundaries

500

The process where old crust is recycled by being pushed under another plate into the mantle is called

subduction

500

According to Wegener, what evidence supports the theory of continental drift in which the continents were all together as one landmass?

fossils from other area appears on different continents. 

continents fit like puzzle