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Creativity
Asked 2 months ago · Viewed 16 times
हिन्दी English

Consider the following statements regarding tectonic movements and volcanic and seismic events occurring in the interior of the Earth:

  1. 1. The higher the silica content in the lava emerging during a volcanic eruption, the more viscous and acidic it is, resulting in extremely explosive eruptions, such as Hawaiian volcanoes which are the most explosive.
  2. 2. Among seismic waves generated during an earthquake, primary waves (P-Waves) are longitudinal waves that can pass through all three mediums: solid, liquid, and gas, while secondary waves (S-Waves) are transverse waves that travel only through solid mediums and disappear when passing through the liquid outer core.
  3. 3. The 'Richter Scale' is a logarithmic scale for measuring the energy or magnitude of an earthquake, meaning that each next whole number on the scale releases about 10 times more amplitude and about 32 times more energy than the previous number.
  4. 4. The circumference of the Pacific Ocean is called the 'Ring of Fire', where more than 75 percent of the world's active volcanoes and about 90 percent of earthquakes are recorded, mainly due to the convergence of the Pacific plate with other continental plates (convergent boundary).

Which of the above statement(s) is/are completely true?

Detailed Explanation

Statement 1 is false because Hawaiian-type volcanic eruptions are very quiet as they emit basic or alkaline lava which has low silica content and minimal viscosity. In contrast, Stromboli or Vulcanian-type volcanoes are highly acidic and explosive. Statements 2, 3, and 4 are completely true. S-waves cannot pass through liquid mediums and disappear in the outer core. The Richter scale is logarithmic and the Ring of Fire is located at convergent boundaries.

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