Podcast
Questions and Answers
What is the phenomenon called when magnetite cools and becomes magnetic again?
What is the phenomenon called when magnetite cools and becomes magnetic again?
- Magnetic reversal
- Curie temperature effect
- Remanent magnetism (correct)
- Thermal demagnetization
What is the key point mentioned about magnetite in the text?
What is the key point mentioned about magnetite in the text?
- Magnetite is found in continental rocks
- Magnetite is always magnetic
- Magnetite loses magnetism when heated above 500°C (correct)
- Magnetite originates from the mantle
Which layer of the Earth's interior has relatively low viscosity and shear strength, allowing it to flow like a liquid on geological time scales?
Which layer of the Earth's interior has relatively low viscosity and shear strength, allowing it to flow like a liquid on geological time scales?
- Mantle
- Asthenosphere (correct)
- Crust
- Lithosphere
What is the weak or 'soft' zone in the upper mantle called?
What is the weak or 'soft' zone in the upper mantle called?
Where do earthquakes, volcanic activity, and mountain-building primarily occur?
Where do earthquakes, volcanic activity, and mountain-building primarily occur?
At what speeds do lithospheric plates typically move in relation to each other?
At what speeds do lithospheric plates typically move in relation to each other?
The top layer of the upper mantle is known as what?
The top layer of the upper mantle is known as what?
Which layer of the Earth is involved in plate movements and isostatic adjustments?
Which layer of the Earth is involved in plate movements and isostatic adjustments?
What creates earthquakes, mountain ranges, volcanic activity, and ocean trenches according to plate tectonics?
What creates earthquakes, mountain ranges, volcanic activity, and ocean trenches according to plate tectonics?
Where are Mid-Oceanic Ridges located geologically and what occurs there?
Where are Mid-Oceanic Ridges located geologically and what occurs there?
What happens to the Oceanic crust when it encounters the Continental crust in plate tectonics?
What happens to the Oceanic crust when it encounters the Continental crust in plate tectonics?
What is the name of the German meteorologist who first suggested the theory of continental drift in 1912?
What is the name of the German meteorologist who first suggested the theory of continental drift in 1912?
How fast do the continents move according to Wegener's theory of continental drift?
How fast do the continents move according to Wegener's theory of continental drift?
Where are most of the world's active volcanoes located according to the text?
Where are most of the world's active volcanoes located according to the text?
What is the average thickness of Earth's shifting slabs or plates according to plate tectonics theory?
What is the average thickness of Earth's shifting slabs or plates according to plate tectonics theory?
What type of evidence strongly suggests that Africa and South America were once joined?
What type of evidence strongly suggests that Africa and South America were once joined?
