the earth and its ocean Flashcards
what are the layers of earth
crust
mantle
outer core
inner core
describe earth crust
thin layer of solid
between 60 to 100 km thick
hard but brittle
describe mantle
around the earth core
thick layer of molten rocks
density of tar
describe outer core
made up of metal
what is an important effect of the iron in the earth core
creates a magnetic field
around the earth it can be used for navigation in the compass
it help some animal navigate during migration
who came up with plate tectonic theory
Alfred Wagner
what does plate tectonic theory state
it state the earth lithosphere consist of continental size plate that are consistently moving
the plate are once pat of a continent called
Pangea
what are boundaries
boundries are were the plates meet
name the 3 type of boundaries
convergent boundaries
transform boundaries
divergent boundries
what is convergent boundries
when the plates collide with each other
what are transform boundaries
were plates slide past each other or when two plates rub each other
what are divergent boundaries
plates the moves past each other
volcanoes and mountain form as a result of
convergent boundaries
describe plate tectonic theory
in 1912 ———— put forward theory of continental drift he ——- that ———million years ago the was one single ——which he called ——– two hundred million years ago it ——- up into —— ——- which slowly drifted ——- these pices of earth crust are called plates
