Seafloor Spreading Theory Quiz Questions And Answers
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Take the Seafloor Spreading Theory quiz to test your knowledge regarding the same topic. Carefully give answers to every question asked here to score the best. Basically, this hypothesis was proposed to explain the mid-ocean ridge system where new oceanic crust is formed. If you know enough about this seafloor spreading and can easily get full marks on this quiz below, give it a try and see for yourself. Take up the quiz now and assess your learning.
Questions and Answers
- 1.
Who proposed the seafloor spreading hypothesis?
- A.
Alfred Wegener
- B.
Harry Hess
- C.
Fred Vine
- D.
D. H. Matthews
Correct Answer
B. Harry HessExplanation
Harry Hess proposed the seafloor spreading hypothesis. This theory suggests that new oceanic crust is formed at mid-ocean ridges and then spreads outwards, pushing older crust away from the ridge. Hess's hypothesis was a significant contribution to the understanding of plate tectonics and provided a mechanism for how continents move and interact with each other.Rate this question:
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- 2.
What instrument was used in mapping the variations in the Earth's magnetic field in oceanic rocks?
- A.
Gravitimeter
- B.
Electrical resistivity meter
- C.
Magnetometer
- D.
None of the above
Correct Answer
C. MagnetometerExplanation
A magnetometer is used to map the variations in the Earth's magnetic field in oceanic rocks. Magnetometers are sensitive instruments that can measure the strength and direction of magnetic fields. By using a magnetometer, scientists can detect and map the magnetic anomalies in the oceanic rocks, which can provide valuable information about the Earth's magnetic field and its variations.Rate this question:
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- 3.
What is seafloor spreading?
- A.
A thing in the ocean
- B.
A process that occurs at mid-ocean ridges.
- C.
Something in the sea
- D.
All of the above
Correct Answer
B. A process that occurs at mid-ocean ridges.Explanation
Seafloor spreading is a process that occurs at mid-ocean ridges. This process involves the creation of new oceanic crust as tectonic plates move apart. Magma rises from the mantle and fills the gap, solidifying to form new crust. As the new crust is created, older crust is pushed away from the ridge, leading to the spreading of the seafloor. This process plays a crucial role in plate tectonics and the formation of ocean basins.Rate this question:
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- 4.
Mid-Ocean ridges form long chains of what that rise up from the ocean floor.
- A.
Valleys
- B.
Rivers
- C.
Mountains
- D.
Rocks
Correct Answer
C. MountainsExplanation
Mid-Ocean ridges are underwater mountain ranges that form as tectonic plates move apart. The movement of the plates causes magma to rise and create new crust, which results in the formation of these mountainous ridges. These ridges can stretch for thousands of kilometers and are characterized by volcanic activity, earthquakes, and the presence of hydrothermal vents. Therefore, the correct answer is "mountains".Rate this question:
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- 5.
In which year the seafloor spreading theory was proposed?
- A.
1960
- B.
1970
- C.
1971
- D.
1975
Correct Answer
A. 1960Explanation
The seafloor spreading theory was proposed in 1960. This theory suggests that new oceanic crust is formed at mid-ocean ridges and spreads outwards, pushing the older crust aside. It was proposed by Harry Hess, a geologist and naval officer, who observed evidence such as magnetic anomalies and age differences in the oceanic crust that supported this idea. This theory revolutionized our understanding of plate tectonics and provided a key mechanism for how the Earth's crust is constantly changing and renewing itself.Rate this question:
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- 6.
What does seafloor spreading explain?
- A.
A continental drift
- B.
Fossil fuels
- C.
Both a and b
- D.
Floods
Correct Answer
A. A continental driftExplanation
Seafloor spreading explains the phenomenon of continental drift. It is the process by which new oceanic crust is formed at mid-ocean ridges and spreads outwards, pushing the existing crust apart. This movement of the oceanic crust causes the continents to move and drift over time. The theory of seafloor spreading provides a mechanism for explaining how the continents have moved and changed their positions on the Earth's surface throughout history.Rate this question:
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- 7.
The process by which magma rises forming new oceanic lithosphere layer is called
- A.
Sea floor spreading
- B.
Thermal reversal
- C.
Magnetic reversal
- D.
Electric reversal
Correct Answer
A. Sea floor spreadingExplanation
Sea floor spreading is the correct answer because it refers to the process where magma rises from the Earth's mantle, creating new oceanic lithosphere. As the magma cools and solidifies, it forms a new layer of crust on the ocean floor. This process occurs at mid-ocean ridges, where tectonic plates are moving apart, allowing for the upwelling of magma. Sea floor spreading plays a crucial role in the theory of plate tectonics and is responsible for the continuous expansion of the ocean basins.Rate this question:
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- 8.
Molten rock inside the earth is called
- A.
Magma
- B.
Fossil fuel
- C.
Eruptic volcano
- D.
Solid rock
Correct Answer
A. MagmaExplanation
Molten rock inside the earth is called magma. Magma is formed when rocks in the earth's mantle melt due to high temperatures and pressure. It is a mixture of molten minerals, gases, and solids. Magma can be found beneath the earth's surface in magma chambers and can eventually erupt onto the surface as lava during volcanic eruptions. It is an important component in the formation of igneous rocks and plays a crucial role in shaping the earth's geology and landscapes.Rate this question:
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- 9.
Which one of the following is not an evidence of seafloor spreading?
- A.
The molten material
- B.
Magnetic stripes
- C.
Seafloor drilling
- D.
Fossil fuels
Correct Answer
D. Fossil fuelsExplanation
Fossil fuels are not evidence of seafloor spreading because they are formed from the remains of ancient plants and animals that lived on land or in bodies of water such as lakes and swamps. Seafloor spreading, on the other hand, refers to the process where new oceanic crust is formed at mid-ocean ridges and spreads outwards. The molten material, magnetic stripes, and seafloor drilling are all pieces of evidence that support the theory of seafloor spreading.Rate this question:
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- 10.
Seafloor spreading theory is also known as
- A.
Theory of hypothesis
- B.
Theory of plate tectonics
- C.
The mid-ocean ridge system
- D.
None of the above
Correct Answer
C. The mid-ocean ridge systemExplanation
The correct answer is "the mid-ocean ridge system." This is because seafloor spreading theory explains how new oceanic crust is formed at the mid-ocean ridges, where tectonic plates are moving apart. As the plates separate, magma rises from the mantle and solidifies to form new crust, pushing the existing crust away from the ridge. This process of crust formation and movement is known as seafloor spreading, and it occurs primarily at the mid-ocean ridge system. Therefore, the theory of seafloor spreading is closely associated with the mid-ocean ridge system.Rate this question:
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Current Version
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Mar 21, 2023Quiz Edited by
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Feb 16, 2022Quiz Created by
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