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Types of Rocks & Sea Floor Spreading Theory Video Lecture | Geography for UPSC CSE
FAQs on Types of Rocks & Sea Floor Spreading Theory Video Lecture - Geography for UPSC CSE
| 1. What are the three main types of rocks? |  |
Ans. The three main types of rocks are igneous, sedimentary, and metamorphic. Igneous rocks are formed from solidified lava or magma, sedimentary rocks are formed from the accumulation and compression of sediments, and metamorphic rocks are formed when existing rocks undergo intense heat and pressure.
| 2. How does sea floor spreading occur? | |
Ans. Sea floor spreading occurs at mid-oceanic ridges where tectonic plates move apart. Magma rises from the mantle and creates new oceanic crust, which then spreads out in opposite directions. As the new crust forms, older crust is pushed away, creating a continuous process of spreading and the formation of new ocean floor.
| 3. What evidence supports the theory of sea floor spreading? | |
Ans. The theory of sea floor spreading is supported by several lines of evidence. One piece of evidence is the magnetic striping found on the oceanic crust, where alternating bands of normal and reversed magnetic polarity mirror the Earth's magnetic field reversals. Additionally, the age of the oceanic crust gets progressively older as one moves away from the mid-oceanic ridges, providing further support for the theory.
| 4. How does sea floor spreading contribute to plate tectonics? | |
Ans. Sea floor spreading is a key process in plate tectonics. As new oceanic crust forms and spreads apart, it pushes the existing crust away from the mid-oceanic ridges. This continuous movement of the crust drives the motion of tectonic plates, leading to the formation of new crust and the recycling of old crust through subduction zones.
| 5. Can sea floor spreading cause earthquakes? | |
Ans. Yes, sea floor spreading can cause earthquakes. As tectonic plates move apart during the process of sea floor spreading, the stress that builds up along the boundaries can eventually be released in the form of earthquakes. These earthquakes are typically shallow and occur along the mid-oceanic ridges, where the spreading is most active.
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