Seafloor Spreading Worksheet
This worksheet covers key concepts of seafloor spreading, including evidence, processes, and related geological features, suitable for Grade 9 science students.
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Seafloor Spreading Worksheet
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Read each question carefully and answer to the best of your ability.
1. Which of the following provides evidence for seafloor spreading?
The presence of volcanoes on continents
Magnetic stripes on the ocean floor
The formation of mountain ranges
The occurrence of earthquakes in stable continental areas
2. Where does new oceanic crust form?
Oceanic trenches
Mid-ocean ridges
Subduction zones
Continental shelves
3. Seafloor spreading occurs at plate boundaries.
4. The process where oceanic crust sinks back into the mantle is called .
5. The age of the oceanic crust with increasing distance from the mid-ocean ridge.
6. Seafloor spreading is a continuous process that adds new material to the ocean floor.
True
False
7. The Mid-Atlantic Ridge is an example of a convergent plate boundary where seafloor spreading occurs.
True
False
8. Describe the role of convection currents in the mantle in driving seafloor spreading.
9. Explain how the discovery of magnetic reversals on the seafloor supported the theory of seafloor spreading.
Use the words below to complete the sentences.
10. At plate boundaries, plates move apart, and new crust is formed.
11. The process of explains how oceanic crust is recycled into the mantle.
12. Rocks found closer to the mid-ocean ridge are generally than rocks found further away.