Seafloor Spreading Worksheet
Explore the theory of seafloor spreading, its evidence, and its role in plate tectonics with this Grade 12 science worksheet.
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Seafloor Spreading: Grade 12 Science
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Read each question carefully and provide concise, detailed answers based on your understanding of seafloor spreading and plate tectonics.
1. Which of the following is the primary driving force behind seafloor spreading?
Gravitational pull of the moon
Convection currents in the mantle
Earth's rotation
Magnetic field reversals
2. Where does new oceanic crust form?
Oceanic trenches
Subduction zones
Mid-ocean ridges
Continental shelves
1. The theory of seafloor spreading was proposed by .
2. Seafloor spreading occurs at plate boundaries.
3. As new crust is generated at mid-ocean ridges, older crust is consumed at .
1. The age of oceanic crust increases with increasing distance from a mid-ocean ridge.
True
False
2. Magnetic stripes on the seafloor provide evidence for continental drift.
True
False
1. Describe the process of seafloor spreading, including the role of magma and the formation of new crust.
2. Explain how magnetic anomalies on the seafloor provide compelling evidence for seafloor spreading.
3. Refer to the diagram above. Identify and explain two features visible in the diagram that are characteristic of a mid-ocean ridge system.