earth's interior 000000000306020250.pptx

earth's interior

1. Lesson 1: Earth’s Interior

2. 1 What layers compose Earth’s core? 2. The upper mantle and crust make up which layer of Earth’s interior? 3. What is the name of the thickest layer of Earth’s interior? 4 How thick is the outer core in kilometers? 5. Which is thicker—oceanic crust or continental crust? 6. The plates that move about Earth's surface are pieces of the______________. 7. What is the aesthenosphere and why is it important? 8. What material makes up most of the outer core? Is it solid or liquid? Why? 9. What material makes up most of the inner core? Is it solid or liquid? Why? 10. What very important process happens in the outer core? Why is it important? Activity: Earth’s Interior

3. Earth’s Interior diagrams of Earth’s interior show it as having three layers—an outer crust , a mantle , and a core

4. Crust The crust is the outermost surface of Earth. Oceanic crust lies under the oceans and is thin. Its average thickness is about 5 kilometers. Continental crust forms continents and is thicker. mantle is the layer between the crust and the core. The mantle is about 2,900 kilometers thick. Mantle lithosphere includes the crust and a thin part of the mantle. This thin, outer-most mantle is called the upper mantle. The plates that move about Earth’s surface are pieces of lithosphere. Lithosphere Aesthenosphere Lies just under the lithosphere and is the outermost part of the lower mantle. A slushy zone of hot rock with a small amount of melted rock. This is important because the lithospheric plates slide on it.

5. The core Outer core The outer core is made mostly of iron, and is so hot the iron is melted. Powerful electric currents are formed as the liquid outer core moves. These electric currents create Earth’s magnetic field. This magnetic field protects the planet from harmful solar radiation It also protects the atmosphere. Life on Earth would be in danger if the outer core cooled and stopped moving. Inner core The inner core is also made mostly of iron, but it is solid. The inner core is also hot enough to melt iron, the center of Earth; it is divided into the inner core and the outer core.