How Is The Earth Layered?
1. _____________ Compositiona. What it is _______ of
b. Different Elements
2. _____________/Mechanical Propertiesa. What it _______
b. Consistency and texture
DENSITY is the Key!• Elements have different ____________
-Golf ball vs. Ping Pong ball– Amount of ____________ in an object
• Earth’s __________ sucks in dense elements!– Which layer is the most dense?– Which layer is the least dense?
• The less dense compounds make up the ___________ and the ___________, and the dense compounds make up the___________.
The Four Layers The Earth is composed of
______ different layers. The
________ is the layer that you live on, and it is the most widely studied and understood.
The ________ is much hotter and has the ability to
________. The ________ and ________ are even hotter with ___________ so great you would be squeezed into a ball smaller than a marble if you were able to go to the center of the Earth!
The Crust
The crust is composed of ____ rocks. The_____________ _______ is mostly granite. The _____________ _______ is basalt. Basalt is much __________ than the granite. Because of this the less dense continents ride on the denser oceanic plates.
The Mantle
The Mantle is the largest layer of the Earth. The _______ mantle is composed of very hot dense rock that flows like asphalt under a heavy weight. The movement of the _____________ _______ (asthenosphere) is the reason that the crustal plates of the Earth move.
The Lithosphere
The crust and the _______ layer of the mantle together make up a zone of rigid, brittle rock that breaks easily called the _______________.
The Lithospheric Plates
The crust of the Earth is broken into many pieces called _______. The plates "float" on the soft, semi-rigid __________________.
Asthenosphere
• Upper/Mid- _______ Plastic
• Solid that _______
The Asthenosphere
The asthenosphere is the semi-rigid part of the _______ mantle that flows like hot asphalt under a heavy weight.
Convection Currents
The middle mantle “_______” because of ______________ currents. Convection currents are caused by the very _______ material at the deepest part of the mantle rising, then _________ and sinking again --repeating this cycle over and over.
Convection Currents The next time you heat anything like
soup or water in a pan you can watch the _____________ __________ move in the liquid. When the convection currents flow in the asthenosphere they also move the _______. 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!
______________
• _______ Mantle• Strong• Solid
The Outer Core
Refer back to paragraph 4 in close reading.
The Inner Core
Refer back to close reading paragraph 5.
The Layers of the Earth
© Copyright 2006. M. J. Krech. All rights reserved.
Summative Activity
• Using your guided notes from today, and your close reading notes to write a summary in your foldable from last Thursday. You will write a summary for each layer as if you were describing each layer to your little brother or little sister. Make sure to describe the chemical and physical features of each.
