Q-2 (A)
2. Why did the European people need to find new waterways?
Write the answers in short.
1. What percentage of the earth's surface is covered by lithosphere?
2. Up to how many kms from the earth's surface does the atmosphere extends?
3. What are the parts with large reservoirs in hydrosphere called ?
4. Which gas absorbs the ultraviolet rays of the Sun?
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Answers
1. The oceanic lithosphere covers approximately 60% of the Earth's surface. Well-constrained measurements of the seismic velocity structure of the crust and upper mantle beneath the ocean floor are sparse.
2. Most people think that the Earth's atmosphere stops a bit over 62 miles (100 km) from the surface, but a new study based on observations made over two decades ago by the joint US-European Solar and Heliospheric Observatory (SOHO) satellite shows that it actually extends as far 391,000 miles (630,000 km) or 50 times
3. Oceans, rivers, glaciers, aquifers/ground water, atmosphere, and biosphere. Oceans are the largest reservoir. Frozen hydrosphere is the largest reservoir of fresh water, but ground water is the largest AVAILABLE source of fresh water.
4. Ozone ( O₃ ) gas absorbs ultraviolet rays of the sun. It is present in the atmosphere.
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