Transcript Inside the Earth

Inside the Earth
?
If you journeyed to the center of
the Earth, what would you think
you would see along the way?
Read pages 88-89
&
ID the Composition of the Earth
3 layers
• Earth has ____
Be able to name, locate the layers’
positions and
describe each
• Earth has 3 layers
1.Crust
2. Mantle
3. Core
1)Crust -
FYI –crust is less than
1% of Earth’s mass.
 outermost layer
 thinnest layer
 2 types of crust- 1- Continental - (land above ocean)
2- Oceanic - (land under ocean)-
After you get through the crust what comes next?
2) Mantle –
 between crust and core
 thickest layer
FYI –mantle is 67%
of Earth’s mass.
We’re finally there!
3) Core
 bottom of mantle to the center of the
Earth
 made up of mostly iron
 two parts: 1. Outer Core:
liquid layer of core just beneath
mantle and surrounds inner core
2. Inner Core:
solid dense center of the Earth
Read 90-91
Structure of the Earth
• Be able to Identify the three main spheres of the
Earth.
• What order they appear in the Earth.
• What layers (crust, mantle, core) of the Earth
they contain, if any.
• If they are hard, soft, move, or simply stay still.
1:
Lithosphere
outermost rigid layer of the Earth
includes crust and upper part of mantle
divided into tectonic plates *
Lithosphere
2:
Asthenosphere
soft layer of the mantle
moves tectonic plates
made of solid rocks
Asthenosphere
3:
Mesosphere
strong lower part of mantle down to core
(not including core)
Mesosphere
Did someone say tectonic plates?
Read page 92
• What are they?
• How many major plates are there?
• What do they do?
• What are they like?
• How are they shaped?
Alfred Wegner
We understand plate tectonics because of Alfred’s
explanation of continental drift theory. He believed
that all continents were once one land = PANGEA
and there was also one ocean = PANTHALASSA.
It is known today as theory of plate tectonics
which explains that top layers of Earth
Move causing different stresses in our land
structures.
~Tectonic Plates~
Earth is like a giant jigsaw puzzle
Moves from the Asthenosphere
3-D
10 major plates