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.