Earth’s Interior By Bobby Robinson

Guide For Reading What does a geologist do? What are the main layers of Earth’s surface? What are the characteristics of Earth’s crust, mantle, and core?

Geologists examine the layers of Earth to answer what three questions? How old is Earth? How has Earth’s surface changed over time? Why are there oceans, and how did they form?

Geologists divide the forces that change the earth’s surface into two groups: Constructive forces Examples? Destructive forces

Evidence of Earth’s Interior Direct- drilling for rock samples Indirect- Seismic waves Primary waves-fastest ->Longitudinal movement Secondary waves-> traverse movement Surface waves-most destructive-

Seismic Activity Today

Temperature Near the surface would be cool 20 meters down the rock gets warmer For every 40 meters that descends a temperature increases 1°C

Pressure The pressure increases as you go deeper inside the earth because amount and weight of the rock increases

Earth’s layers The three main layers make up Earth’s interior: The crust The mantle The core

Crust Outer layer of earth Consist of oceanic and continental crust Oceanic is made of basalt-a dense, dark, fine coursed rock. Continental is made of granite.

Mantle Largest part of earth’s makeup Consist of lithosphere and Asthenosphere Lithosphere: The upper most mantle and the crust form a solid rigid Asthenosphere: The soft portion of the mantle in which the lithosphere floats

Core Inner core – dense iron and nickel, solid ball Outer core- molten iron and nickel Shields earth from harmful radiation from the sun.

Thank You Core!!!