With reference to the water on the planet Earth, consider the following statements : 1. The amount of water in the rivers and lakes is more than the amount of groundwater. 2. The amount of water in polar ice caps and glaciers is more than the amount of groundwater. Which of the statements given above is/are correct ?
2 only
Let's analyze the statements regarding the distribution of water on Earth.
Understanding Global Water Distribution
The Earth has a vast amount of water, but its distribution across different reservoirs varies significantly. The total amount of water includes saltwater in oceans and freshwater found in ice caps, glaciers, groundwater, lakes, rivers, soil moisture, and the atmosphere.
It's important to differentiate between the total water and freshwater. Oceans hold about 97.5% of the total water, which is saline. Freshwater accounts for only about 2.5% of the total water.
Let's look at the breakdown of freshwater distribution:
| Freshwater Reservoir | Approximate Percentage of Total Freshwater |
|---|---|
| Ice caps and Glaciers | 68.7% |
| Groundwater | 30.1% |
| Surface Water (Lakes, Rivers, Swamps, etc.) | 1.2% |
| Other (Soil moisture, atmospheric water, biological water) | Minor amounts within the 1.2% surface water category or separate small percentages. |
Now let's evaluate each statement based on these typical percentages.
Analyzing Statement 1: Rivers and Lakes vs. Groundwater
Statement 1 says: "The amount of water in the rivers and lakes is more than the amount of groundwater."
- From the distribution table, groundwater accounts for approximately 30.1% of the total freshwater.
- Surface water, which includes rivers, lakes, and swamps, accounts for approximately 1.2% of the total freshwater.
- Specifically, freshwater lakes hold about 0.26% of total freshwater, and rivers hold about 0.006% of total freshwater.
- Comparing 1.2% (surface water including lakes/rivers/swamps) or even just lakes/rivers (much less than 1.2%) to 30.1% (groundwater), it is clear that the amount of groundwater is significantly more than the amount of water in rivers and lakes combined.
Therefore, Statement 1 is incorrect.
Analyzing Statement 2: Polar Ice Caps and Glaciers vs. Groundwater
Statement 2 says: "The amount of water in polar ice caps and glaciers is more than the amount of groundwater."
- From the distribution table, polar ice caps and glaciers account for approximately 68.7% of the total freshwater.
- Groundwater accounts for approximately 30.1% of the total freshwater.
- Comparing 68.7% (ice caps/glaciers) to 30.1% (groundwater), the amount of water stored in polar ice caps and glaciers is indeed more than the amount of groundwater.
Therefore, Statement 2 is correct.
Conclusion on Statements about Earth's Water
Based on the analysis:
- Statement 1 is incorrect because groundwater is a much larger reservoir than rivers and lakes.
- Statement 2 is correct because polar ice caps and glaciers hold more freshwater than groundwater.
Thus, only Statement 2 is correct.
Revision Table: Key Water Reservoir Comparisons
| Reservoirs Compared | Larger Reservoir | Approximate Ratio (Larger : Smaller) |
|---|---|---|
| Groundwater vs. Rivers + Lakes | Groundwater | ~30 : 1 (considering surface water vs. groundwater) |
| Ice Caps/Glaciers vs. Groundwater | Ice Caps/Glaciers | ~2 : 1 (considering ice/glaciers vs. groundwater) |
Additional Information on Earth's Water Resources
While polar ice caps and glaciers hold the largest portion of freshwater, this water is mostly inaccessible for direct human use. Groundwater represents the largest reservoir of accessible freshwater, making it a critical resource for drinking water, irrigation, and industrial uses in many parts of the world. Surface water in lakes and rivers, while a small percentage, is the most readily accessible source and is crucial for many ecosystems and human activities.
Understanding the distribution and movement of water on Earth is essential for managing water resources sustainably, especially in the face of climate change and increasing global water demand. The water cycle, which involves processes like evaporation, condensation, precipitation, and runoff, continuously moves water between these different reservoirs.
Important Questions from Origin and evolution of Universe Solar system
A huge collection of gas, dust and billions of stars is called a:
The Greenwich Mean Time is the local time at :
The force exerted by rotation of the earth is known as:
How many hours is one solar day
Moon changes its shape everyday due to:
