Podcast
Questions and Answers
What is the main reason that magma tends to rise from within the Earth?
What is the main reason that magma tends to rise from within the Earth?
- It is more dense than the surrounding solid rock
- The decay of radioactive elements like uranium and thorium
- It contains dissolved gases like carbon dioxide and hydrogen sulfide
- The liquid rock is less dense than the surrounding solid rock (correct)
Why can magma vary in composition?
Why can magma vary in composition?
- Because it contains dissolved gases such as carbon dioxide and hydrogen sulfide
- Because it forms when rocks melt and rocks are made of different minerals with different melting points (correct)
- Due to the gravitational accumulation and collisions of materials during the early solar system
- Because it is leftover from Earth's violent past
What term is used to refer to magma when it reaches the surface of the Earth?
What term is used to refer to magma when it reaches the surface of the Earth?
- Solid rock
- Lava (correct)
- Liquid rock
- Molten rock
What is a common misconception when people refer to magma?
What is a common misconception when people refer to magma?
How is magma formed?
How is magma formed?
What is the relationship between magma and solid materials according to the text?
What is the relationship between magma and solid materials according to the text?
Where is magma typically located within the Earth?
Where is magma typically located within the Earth?
What are some regions where magma accumulates according to the text?
What are some regions where magma accumulates according to the text?
What processes allow solid rock to melt within the upper mantle and crust?
What processes allow solid rock to melt within the upper mantle and crust?
What happens as material rising from convection currents experiences a decrease in pressure?
What happens as material rising from convection currents experiences a decrease in pressure?
What contributes to the melting of crust material at subduction zones?
What contributes to the melting of crust material at subduction zones?
What is a characteristic of felsic magma compared to mafic magma?
What is a characteristic of felsic magma compared to mafic magma?
What happens when magma reaches the Earth's surface?
What happens when magma reaches the Earth's surface?
What makes magmas formed from mantle plumes different from those formed from melting crust material?
What makes magmas formed from mantle plumes different from those formed from melting crust material?
What is the role of water in the formation of magma at subduction zones?
What is the role of water in the formation of magma at subduction zones?
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