PowerPoint on Inside the Earth Video: Inside the Earth September 23, 2014 Welcome! Agenda New Seating Roll Pass Out New Notes PowerPoint on Inside the Earth Video: Inside the Earth

Subject Area: Inside the Earth EQ: What is the solid Earth made of? Questions: What are the layers of the Earth based on what they are made of? What are Tectonic Plates?

Inside the Earth 1. The Composition of the Earth 2. The Structure of the Earth 3. Tectonic Plates 4. Mapping the Earth’s Interior

The Composition of the Earth The Earth is divided into three layers. The outer layer is lighter than that of the inner material. Because the outer layer is lighter it floats on top of the lower layers. 1. The Crust 2. The Mantle 3. The Core

The Composition of the Earth The crust is the outermost layer of the Earth. It ranges from 5 to 100 km thick. It is also the thinnest layer of Earth. There are two types of crust, the continental crust and the oceanic crust. Partner Question: What are the two types of crust on the Earth?

The Composition of the Earth The mantle is the layer of the Earth between the crust and the core. It is very thick. It is about 2,900 km thick and contains most of the Earth’s mass. Scientists have never actually seen the mantle, yet they have been able to study what parts have been pushed up to the surface. Partner Question: What is the Mantle?

The Composition of the Earth The core extends from the mantle to the center of the Earth. Scientists think the core is made up of nickel and possibly some sulfur and oxygen. The diameter of the Core is about 6,856 km. This is slightly larger that the entire planet of Mars.

The Structure of the Earth Another way to look at how the Earth is made up is to examine the physical properties of it’s layers. Lithosphere - The outermost rigid layer of the Earth. It is made up of pieces called Tectonic Plates. Asthenosphere - a soft layer of the mantle on which pieces of the lithosphere move. Partner Question: Where is the Lithosphere located?

The Structure of the Earth Mesosphere - Strong lower part of the mantle under the asthenosphere. It extends to the core. Outer Core - The liquid layer of the Earth’s core. It lies beneath the mantle and surrounds the inner core. Partner Question: Where is the Mesosphere located?

The Structure of the Earth Inner Core - Solid dense center. It is about 6,378 km beneath the surface.

Tectonic Plates Tectonic Plates - Pieces of the lithosphere that move around on the top of the asthenosphere A Giant jig-saw puzzle Partner Question: What are Tectonic Plates?

Mapping the Earth’s Interior We know about the Earth’s interior because of earthquakes. When an earthquake happens it causes vibrations, called seismic waves. Seismic waves are vibrations that travel through the Earth. Seismic waves will travel at different speeds through material that might be thicker or thinner. The scientists measure these waves and determine what the material is made of. Partner Question: What are seismic waves?

Inside the Earth What did I know? 1. 2. 3. What did I learn? What do I want to know more about?

No Talking is equal to No Writing Inside the Earth No Talking is equal to No Writing for this video It is your choice!!!!