LESSON TWO ‧₊˚✩彡.
plate boundaries – are the lines at the edges of the
different pieces of lithosphere.
– lithospheric plates are moving due to the convection
current in the earth’s interior.
Lithosphere – it is made up of crust and upper part of
the mantle.
two types of crust
Continental Crust - it is made up of granite, low
density.
Oceanic Crust – it is made up of basalts, high
density.
always remember, when magma moves in the
aesthenosphere the plate tectonic that are located at the
crust are moving too.
different types of boundaries
Divergent Boundary
– also known as constructive boundary.
– it refers to plates that separate and move apart in
opposite directions.
– new crust is created as magma cools and solidifies.
magma solidifies because of the water and air.
some info, the red sea is one example of it, it all started
when the Arabic plate and African plate started to separate
from each other.
The magma that can’t get out of the rift valley is finding
another way in order for them to go out. It is also the reason
why there is a volcano around the boundaries.
if the land is located at the center of the rift, it means that it
is the newest and hottest land. but when the land is far from
the rift, it means that it is older and cooler land.
(continental – continental) – rift valley.
(oceanic – Oceanic) – seafloor spreading, mid
ocean ridge.
