Science A1
a theory that explains the different processes that causes the formation
plates tectonic theory
a german meteoroligist and geophysicist
alfred warner
the year alfred hypothesised and suggested the landmasses were once a supercontinent named Pangea
1915
a supercontinent 250 million years ago
pangaea
is the outermost layer of earth
lithosphere
is ticker and less dense
continental crust
a lithosphere that is divided into fragments
plates
mostly found along plate margins which can either be destructive or constructive
volcano distribution
overtime the magma builds a series of volcanos known as
volcano arc
most of these volcano arcs are formed in the
pacific ring of fire
formed due to the movement of plates either apart of through each other
mountains
is an american geologist who served in the military
Harry H. Hess
the crust is divided into
continental crust
oceanic crust
has an average density of 2.7 g/cm³ and thickness 34-70 km
continental crust
primary composition is granite
continental crust
has an average density of 3.0 g/cm³ with a thickness of 7-10 km — it's primary rock composition is basalt
oceanic crust
is a ducting later under the solid lithosphere
asthenosphere
are plate boundaries where the plates move apart from each other
divergent plate boundaries
are plate boundaries that move toward each other
convergent plate boundaries
are plate boundaries that slide past each other
tranform plate boundaries