Water #1

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Water is probably Earth’s most precious resource. After all, we can’t live without it. Earth is the only known planet to have water. Our entire planet is covered in water, with little pieces of land called continents here and there. Our oceans are not the only places we have water. It is also present under the ground and as vapor in the air. Clouds formed by the vapor ensure that
water falls back down to Earth as rain, sleet, snow or hail.
So with so much water all around us, why do we hear so much about the need to conserve water? It has to do with the water’s salinity, or saltiness. Ocean water has too much salt in it for us to drink. Much of the water that falls back to Earth in one form or another becomes runoff. It travels some distance over land before making its way back to one of Earth’s oceans. As it travels over land, the water picks up salts and minerals from the rocks and soil and washes them into the ocean. The deposits have built up over many years. That is why ocean water is so salty.
Approximately 97% of Earth’s water is salt water. The process of desalination, or removing salt from water, is expensive. That leaves only about 3% that is freshwater for meeting the needs of people, plants and animals. This is why there is concern for protecting this rare and critical
resource. Unfortunately, only about a third of our freshwater is even available for us to use. The rest is frozen solid in glaciers, in the snow on high mountaintops and in the polar ice caps. So the end result is that we have only about 1% of all the water on Earth that we can use.
The freshwater we use comes from surface water and groundwater.
Surface water, just as it sounds, is water we can see in ponds, rivers, lakes and streams. Groundwater is water that seeps down into the ground and collects in the spaces between rocks and soil underground. You can find water just about anywhere on Earth if you dig far enough into the ground.
It is important to protect our water supplies from pollution. Once the water becomes polluted, it can be difficult or even impossible to clean. Chemicals, like cleaning supplies, paints and other toxins, can seep into the ground and make the water unusable. People must dispose of their waste products appropriately so we will have plenty of freshwater to go around.
MCQ:
MCQ1
According to the text, why is the majority of Earth's water unsuitable for human consumption?
a.It contains industrial pollutants that are impossible to filter.
b.It lacks essential minerals required for drinking water.
c.It has a high concentration of salt accumulated over time.
d.It remains frozen in underground reserves and glaciers.
MCQ2
What is the main process responsible for increasing the salinity of ocean water over time?
a.The melting of polar ice caps releasing ancient salt deposits.
b.The evaporation of freshwater directly from the ocean surface.
c.Water travelling over land as runoff and carrying minerals from rocks and soil.
d.Chemical reactions between underwater rocks and atmospheric vapor.
MCQ3
What total percentage of Earth's overall water supply is accessible freshwater available for use?
a.97%
b.3%
c.About 1%
d.Approximately 33%
MCQ4
Based on the passage, why is desalination not widely relied upon to solve freshwater scarcity?
a.The technology is not yet capable of removing salt from water.
b.The process requires significant financial expenditure.
c.It damages the ocean ecosystem beyond repair.
d.It removes essential nutrients, making the water unsafe to drink.
MCQ5
What prevents the majority of Earth's freshwater from being used by humans, plants, and animals?
a.It is locked in solid form in glaciers, mountain snow, and ice caps.
b.It evaporates into the atmosphere before it can be collected.
c.It is trapped in deep underground aquifers that cannot be reached.
d.It is heavily contaminated by toxic runoff before reaching lakes.
MCQ6
Groundwater is best described as water that:
a.Remains permanently frozen beneath the surface layer of soil.
b.Collects in the atmosphere as vapor before falling as rain.
c.Flows visibly across the surface in rivers, lakes, and streams.
d.Percolates through the earth and accumulates in underground rock and soil spaces.
MCQ7
In the context of the passage, what does the word "runoff" refer to?
a.Liquid water that evaporates rapidly into clouds due to high temperatures.
b.The sudden overflow of rivers caused by melting glaciers.
c.Polluted water discarded by industrial plants and household systems.
d.Water that drains away over the surface of the land toward larger bodies of water.
MCQ8
Why does the author describe water pollution as particularly dangerous for our water supply?
a.It instantly turns freshwater into saltwater.
b.It causes ocean levels to drop significantly.
c.Polluted water rapidly evaporates and ruins the atmosphere.
d.Cleaning contaminated water can be extremely challenging or impossible.
MCQ9
Which of the following best states the main idea of the passage?
a.Water cycles continuously through precipitation, runoff, and evaporation.
b.Earth has vast amounts of water, but usable freshwater is rare and requires careful protection.
c.Oceans make up most of the Earth, making desalination our best future option.
d.Groundwater is the cleanest and most abundant source of water available to humans.
MCQ10
What action does the passage suggest humans must take to safeguard our freshwater resources?
a.Build more facilities to freeze surface water for storage.
b.Stop relying on surface water and dig deeper wells for groundwater.
c.Properly dispose of waste products and harmful chemicals.
d.Increase rainfall by managing atmospheric water vapor.