How Is The Earth Layered? _____________ Composition a. What it is _______ of b. Different Elements _____________/Mechanical Properties a. 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 Earth's Crust is like the _______ of an apple. It is very thin in comparison to the other three layers. The crust is only about ______ miles (8 kilometers) thick under the __________ (oceanic crust) and about 25 miles (32 kilometers) thick under the _______________ (continental crust).

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 Outer Core The core of the Earth is like a _______ of very hot metals. The outer core is so hot that the metals in it are all in the ____________ state. The outer core is composed of the melted metals of ________ and iron.

The Inner Core Refer back to close reading paragraph 5.

The Inner Core The inner core of the Earth has _______________ and pressures so great that the metals are squeezed together and are not able to move about like a liquid, but are forced to ____________ in place like a ________.

The Layers of the Earth Be sure to use foldable to study. © 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.