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The Origin & Evolution of the Earth: Introduction Video Lecture | Geography Class 11 - Humanities/Arts
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FAQs on The Origin & Evolution of the Earth: Introduction Video Lecture - Geography Class 11 - Humanities/Arts
| 1. What is the theory of how the Earth was formed? |  |
Ans. The prevailing scientific theory is that the Earth formed approximately 4.5 billion years ago from the solar nebula, a rotating disk of gas and dust left over from the formation of the Sun.
| 2. How did the Earth's atmosphere evolve over time? | |
Ans. The Earth's early atmosphere was likely composed of hydrogen and helium, but volcanic activity led to the release of gases like carbon dioxide and water vapor. Over time, photosynthetic organisms contributed oxygen to the atmosphere, leading to the composition we have today.
| 3. What evidence supports the theory of plate tectonics in the Earth's geological history? | |
Ans. Evidence for plate tectonics includes the distribution of earthquakes and volcanoes along plate boundaries, the matching coastlines of continents like South America and Africa, and the presence of magnetic striping on the ocean floor.
| 4. How has the Earth's climate changed over geological time scales? | |
Ans. The Earth's climate has undergone significant changes over geological time scales, including ice ages, periods of extreme warmth, and fluctuating levels of greenhouse gases in the atmosphere due to natural processes and human activities.
| 5. What role did asteroid impacts play in shaping the Earth's history? | |
Ans. Asteroid impacts have played a significant role in shaping the Earth's history, including causing mass extinctions like the one that led to the demise of the dinosaurs. These impacts have also contributed to the formation of large impact craters and reshaping the Earth's surface.
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Nov 17, 2024 Last updated |
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