Presentation on theme: "Inside the Earth. The Composition of Earth The Earth is divided into three layers… The crust, mantle, and the core based on what each one is made up of."— Presentation transcript:
The Composition of Earth The Earth is divided into three layers… The crust, mantle, and the core based on what each one is made up of. The lightest materials make up the outer layer, the densest materials make up the inner layers.
Composition (What it is made of) Crust Mantle Outer Core Inner Core
The Crust Outer layer 5-100 km thick 2 types of crust –O–Oceanic Composed of basalt (rock) –C–Continental composed of granite (rock)
Oceanic vs. Continental Crust Composition: granite (Rock) average thickness of 40 km. Temperature= air temperature to 870°C Composed of Granite Composition: basalt (rock) 5-10 km thick Temperature= water temperature to 870°C Composed of Basalt
The Mantle Composed of mostly of iron and magnesium Thickness: 1800-2900 km thick State of matter: upper mantle is solid, lower mantle is liquid Temp =870-3700°C Density= more dense than the crust
The Mantle… It is made up mostly of iron and magnesium, which is very dense. The mantle acts like silly putty or laffy taffy. The density ranges from 3.4-4.4 g/cm 3 Temperature=870-3700°C Lots of Pressure!
The Outer Core It is composed of liquid iron and nickel, which causes Earth’s magnetic field. It is 2,270 km thick It is a liquid Temp: Up to 6,000°C Density=more dense than the mantle
Inner Core Composed of iron and nickel 1216 kilometers thick Solid (Due to Pressure) Temperature=6,000- 7200°C Hotter than the Sun!! Density most dense layer of them all
Earth’s Layers How are the earth’s layers similar to an egg? Shell=crust Egg white=mantle Yolk=core
Do you Remember? 1. What is the difference between continental and oceanic crust? 2. Which layer is the hottest? 3. Arrange Earth’s layers from hottest to coolest. 4. What layer is the least dense? 5. A drilling rig can dig down 6 kilometers. What layer of Earth would you more than likely be in?
Physical Structure of the Earth (5 Layers) Lithosphere- crust and rigid outer layer of mantle (upper mantle) Asthenosphere- solid rock that flows slowly (like hot asphalt, apart of mantle) Mesosphere-The strong, lower part of the mantle. Outer Core- liquid layer Inner Core- solid, very dense
Tectonic Plates Earth’s crust is broken into about 19 pieces These plates move on top of the asthenosphere