Lecture10
Table of Contents
- Motion Inside Earth
- Why study Earth's internal motion?
- Why study Earth's internal motion?
- Why study Earth's internal motion?
- Why study Earth's internal motion?
- Why study Earth's internal motion?
- Why study Earth's internal motion?
- Why study Earth's internal motion?
- Why study Earth's internal motion?
- Why study Earth's internal motion?
- 10.1 How does convection work?
- Convection
- 10.1 How does convection work?
- 10.1 How does convection work?
- 10.1 How does convection work?
- 10.1 How does convection work?
- 10.1 How does convection work?
- 10.1 How does convection work?
- 10.2 What does mantle convection look like?
- 10.2 What does mantle convection look like?
- 10.2 What does mantle convection look like?
- 10.2 What does mantle convection look like?
- 10.2 What does mantle convection look like?
- 10.2 What does mantle convection look like?
- 10.2 What does mantle convection look like?
- 10.2 What does mantle convection look like?
- 10.2 What does mantle convection look like?
- 10.3 How does outer-core convection generate the magnetic field?
- 10.3 How does outer-core convection generate the magnetic field?
- 10.3 How does outer-core convection generate the magnetic field?
- 10.3 How does outer-core convection generate the magnetic field?
- 10.3 How does outer-core convection generate the magnetic field?
- 10.3 How does outer-core convection generate the magnetic field?
- 10.3 How does outer-core convection generate the magnetic field?
- 10.3 How does outer-core convection generate the magnetic field?
- 10.4 How do we know ... Earth's core is a dynamo?
- 10.4 How do we know ... Earth's core is a dynamo?
- 10.4 How do we know ... Earth's core is a dynamo?
- 10.4 How do we know ... Earth's core is a dynamo?
Text and Images from Slide
10.3 How does outer-core convection generate the magnetic field?
- A quandary - field patterns seem to suggest a field arising from deep within Earth.
- Magnets function best at low temperatures, and in fact heating them actually causes a loss in field strength.
- Thus, no permanently magnetic minerals could occur at depth (below 20-30 km).
- The answer is that Earth contains a dynamo, the generation of a dynamic electric current that results in a magnetic field.
Fig 10.13
Magnetic lines resulting from current running through a wire.