Today’s Agenda…12-10 Bellringer: What is a model? What are they used for? Book on page 288 Notes on Inside the Earth BrainPop Quiz on BrainPop

Inside the Earth Study Pack #2

Today’s Goals… I can explain how scientists use evidence to create models of the Earth’s interior. I can describe the layers of the Earth.

What do you already know? True or False Scientists have created models of the Earth by drilling holes to the center of the Earth All of the Earth is solid The Earth’s highest temperature is at its center. Pressure decreases as you go toward the center of the Earth The lithosphere is another name for the inner core.

Creating A Model What is inside the box? How might you figure this out without opening it? Indirect Observation

Using Seismic Waves Earthquakes carry energy through waves Waves move differently through different materials Travels faster in solid rock than in liquid The waves refract when they move from solids to liquids

Using Rock Clues Certain rocks on Earth’s surface are made from materials thought to be deep inside of the Earth

Layers of the Earth Inner Core Outer Core Mantle Crust

Inner Core Solid and dense Mostly made of iron When seismic waves reach this layer they speed up – meaning it is solid Hottest part of Earth Experience a lot of pressure

Outer Core Mostly molten (liquid) metal Stops one kind of seismic wave and slows down another

Mantle Largest layer Solid but flows, similar to silly putty

Crust Mostly thin, can vary All features on earth’s surface are part of the crust The upper part of the mantle and the crust make up the lithosphere

Crust The crust is broken up into pieces called tectonic plates These plates can “float” on the mantle

Patterns in Earth’s Structure Back of Foldable As you go from the crust to the inner core: Density, Temperature, and Pressure INCREASE

Now what do you know? True or False Scientists have created models of the Earth by drilling holes to the center of the Earth All of the Earth is solid The Earth’s highest temperature is at its center. Pressure decreases as you go toward the center of the Earth The lithosphere is another name for the inner core.

Let’s find out more! BrainPop