Topic – Part of static series under the heading – “Oceans, continents and landforms”
5) Explain the concept of seafloor spreading and how is it related to the occurrence of earthquakes and volcanoes?(250 words)
NCERT Class XI Physical Geography – Pg33
Key demand of the question
The question expects us to explain what sea floor spreading is, the evidences that led to the acceptance of this theory by Hess and how the movement of seafloor leads to earthquakes and volcanoes.
Structure of the answer
Introduction – Explain what sea floor spreading is.
Body – Give evidences in favour of seafloor spreading which led Hess to give this theory. Discuss how and why earthquakes and volcanoes are common at the oceanic trenches and mid oceanic ridges respectively. Draw a diagram to explain the mechanism more clearly.