Download Earth layer

Anchor:
• How do you feel the Earth works like a
giant machine? Cite a few examples
• Turn talk and discuss and note your answer.
The Layers of the Earth
© Copyright 2006. M. J. Krech. All rights reserved.
The Crust Annotate
52: Curst: The outer layer of our planet. It lies on
top of tectonic plates.
53: Tectonic plates: Thin plates which float on the
asthenosphere they move in different directions
and shape our curst.
54: Moho: Boundary between crust and mantle
55: Lithosphere: The crust and all the landforms
that are part of it
How is the crust divided?
Check for Understanding
The Mantle Annotate
55: Asthenosphere: Plastic mantle
which allows tectonic plate movement.
56: Mantle: A layer of molten rock
and magma which moves through
convection currents. It is our largest
layer.
Convection Currents
The next time you heat anything like
soup or water in a pan you can watch
the convection currents move in
the liquid. When the convection
currents flow in the asthenosphere
they also move the crust. The crust
gets a free ride with these currents,
like the cork in this illustration.
Safety Caution: Don’t get your face
too close to the boiling water!
How do convection currents
work?
The middle mantle "flows"
because of convection
currents.
59) Convection currents are
caused by the very hot
material at the deepest part
of the mantle rising, then
cooling and sinking again -repeating this cycle over
and over.
Inner and outer Core
57: Outer Core: A layer of
liquid nickel and iron which
is under intense heat and
pressure.
58: Inner core: The inner
most layer of the earth it is
made of solid iron and nickel.
It has the highest temperature
and pressure out of the all of
the layers.
Reading the Reference table
Exit Slip
• What is the relationship between the depth
of the earth’s layers and the pressure and
temperature?
• How do mantle convection currents
influence the way our curst looks like?
Day 2
• Anchor:
Evaluate the statement and correct the errors
• The earth is made up of five layers. The curst is
the thickest layer. Convection currents occur in the
second layer called the mantle. Convection
currents occur when cool magma rises and hot
magma sinks. The inner core is made up of liquid
nickel and aluminum. The outer core is made up
of solid metals.
Revisit the Reference table