Inside the Earth Chapter 7 section 1 Standard

Inside the Earth Chapter 7 section 1 Standard: S 6 E 5. a Compare and contrast the Earth’s crust, mantle, and core including temperature, density, and composition.

Objectives: �Identify the layers of the Earth by their chemical composition. �Identify the layer of the Earth by their physical properties.

The composition of the Earth is divided into 3 layers - the crust, the mantle, and the core – based on the compounds that make up each layer. �Less dense compounds make up the crust and mantle �Densest or heavier compounds make up the core.

The Crust �Solid, outermost layer � 5 to 100 km thick �Temp. ranges 0°C to 1, 000°C �Thinnest layer �Less than 1% of Earth’s mass � 2 types of crust – continental and oceanic �Both mostly contain elements of oxygen, silicon, and aluminum �denser oceanic crust also contains twice as much iron, calcium, magnesium

The Mantle �solid layer between the crust and the core �Contains most of the Earth’s mass, 67% � 2, 900 km thick �Temp. ranges 1000°C to 3, 700°C �Clues about the mantel comes from rocks that have been pushed to the surface, and the ocean floor (underwater volcanoes) �More magnesium and less aluminum and silicon than the crust, denser than

The Core �Layer of the Earth that extends from below the mantle to the center of the Earth. �Outer core – liquid, inner core - solid � 33% of Earth’s mass �Radius of 3, 420 km �Temp. ranges from 3, 700°C to 7, 000°C (sun’s surface temp – 5500°C �Composed mainly of iron and contains smaller amounts of nickel but almost no oxygen, silicon, aluminum, or magnesium.

Earth’s Layers