Presentation on theme: "Inside the Earth If you journeyed to the center of the Earth, what would you think you would see along the way? ?"— Presentation transcript:
Inside the Earth If you journeyed to the center of the Earth, what would you think you would see along the way? ?
Read pages & ID the Composition of the Earth Earth has ____ layers 3 Be able to name, locate the layers’ positions and describe each
1.Crust 2. Mantle 3. Core Earth has 3 layers
1)Crust - 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. FYI –crust is less than 1% 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 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: outermost rigid layer of the Earth Lithosphere includes crust and upper part of mantle divided into tectonic plates * Lithosphere
soft layer of the mantle 2: Asthenosphere moves tectonic plates made of solid rocks Asthenosphere
3: 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~ EEarth is like a giant jigsaw puzzle MMoves from the Asthenosphere 3 3 - D 110 major plates