Earth’s Interior. C hapter 1 Section 1. Guide for Reading. What does a Geologist do?. What are the characteristics of Earth’s crust , mantle , and core ?. The Science of Geology. Geology is the study of planet Earth.
Chapter 1 Section 1
Guide for Reading
What does a Geologist do?
What are the characteristics of Earth’s crust, mantle, and core?
The Science of Geology
Geologyis the study of planet Earth.
Geologists are scientists who study the processes that create Earth’s features and search for clues about Earth’s history.
Forces are constantly changing the surface of the Earth
Earth looks different today than it did millions of years ago.
Constructive forces shape the surface by building up mountains and landmasses
Constructive forces = Build up
Destructive forces slowly wear away the Earth’s features.
Destructive forces = tear down
So whatis inside the Earth’s interior?
The ugly dude in Lord of the Rings?
The deepest mine in the world is only 2.4 miles deep.
The center of the Earth is over 3728 miles deep!
Soif we can’t get to the center of the Earth, how do we know what’s there?
Scientists use seismic waves to infer what the interior of earth is composed of.
Seismicwaves are energy waves that travel through Earth’s interior during earthquakes
A Journey to the Center of the Earth
Temperature and pressure increase as you move into Earth’s interior.
Earth has three major layers
1. The Lithosphere
2. The Mantle
3. The Core
The Lithosphereis the layer of the Earth that includes the Crust and the Upper Mantle
Lithosphere = Crust + Upper Mantle!
By the way, there are two types of crust, continental crust and oceanic crust.
Continental crust is mostly made of the rock Granite. It is not very dense but very thick!
Oceanic crust is mostly made of the rock Basalt. It is thinbut very dense!
The Upper Mantle is just hot solid rock
The Asthenosphere is the softer part of the Mantle. The rocks here are melted and can slowly stretch and flow. Under this layer the mantle becomes solid.
The Outer Core is liquid metal (iron and nickel).
The Inner Core is solid metal (iron and nickel).