1.
Where is most of the Earth's freshwater located?
Correct Answer
A. In icecaps and glaciers
Explanation
Most of the Earth's freshwater is stored in icecaps and glaciers. Even though there is a lot of water on Earth, only a small part of it is freshwater that we can use for drinking, farming, and other needs. Icecaps and glaciers hold about 68.7% of all freshwater, but it's frozen and hard to access. This shows why protecting our freshwater sources and using water wisely is very important.
2.
How is Earth's water supply being continuously renewed?
Correct Answer
B. Through the water cycle
Explanation
Earth's water supply is continuously renewed through the water cycle. This natural process involves evaporation (water turning into vapor), condensation (vapor turning back into liquid), and precipitation (rain or snow). Water evaporates from oceans, lakes, and rivers, condenses to form clouds, and falls back to Earth as precipitation. This cycle is crucial as it distributes fresh water across the globe, helping to sustain all forms of life.
3.
Precipitation may ________ into groundwater.
Correct Answer
C. Infiltrate
Explanation
Precipitation can infiltrate into groundwater. This means that when rain or snow falls to the ground, some of it soaks into the soil and goes deeper into the earth. This process helps fill up aquifers, which are underground layers of water-bearing rocks or materials. Groundwater is a crucial source of water for drinking, agriculture, and other uses. Infiltration is important because it helps maintain the natural storage of freshwater underground.
4.
Is it possible for groundwater to leave an aquifer?
Correct Answer
A. Yes
Explanation
Yes, it is possible for groundwater to leave an aquifer. Groundwater stored in aquifers can move through the soil and rocks, eventually reaching the surface as a spring or seeping into rivers and lakes. It can also be drawn up by plants or extracted by humans using wells for drinking water, irrigation, and other purposes. This natural and human-induced movement is part of the water cycle, helping to distribute and replenish water resources in different areas.
5.
Why can the depth of a water table be high in some places and low in others?
Correct Answer
B. The depth changes due to precipitation, drought, or overuse of wells.
Explanation
The depth of a water table can vary greatly and is high in some places and low in others because it is affected by precipitation, drought, or overuse of wells. When it rains a lot, the water table rises as more water seeps into the ground. During a drought, the water table can drop because there isn't enough rain to replenish it. Similarly, excessive pumping of water from wells for irrigation or drinking can lower the water table in an area. These factors all influence how close or far the water is to the ground surface.
6.
Why is it possible for the rate of movement to vary?
Correct Answer
A. It can be because of the amount of precipitation, porosity of the rock, and slope of the aquifer.
Explanation
The rate at which water moves through an aquifer can vary due to several factors. One key factor is the amount of precipitation an area receives; more rain means more water is available to seep into the ground. Another important factor is the porosity of the rock or soil in the aquifer; more porous materials allow water to move through them more easily. Additionally, the slope or tilt of the aquifer affects how quickly water can flow. Steeper slopes can lead to faster water movement. These variables all influence how quickly groundwater travels through an aquifer.
7.
Can groundwater be accessed by drilling wells?
Correct Answer
B. Yes
Explanation
Yes, groundwater can be accessed by drilling wells. Wells are drilled deep into the earth until they reach an aquifer, where water has accumulated in the spaces between rocks and soil. Once the well reaches the aquifer, water can be pumped up to the surface for use in homes, farms, and industries. Drilling wells is a common method to obtain water for drinking, irrigation, and other needs, especially in areas where surface water is scarce.
8.
44% of all the freshwater is used by __________.
Correct Answer
C. Industry
Explanation
44% of all the freshwater used globally is consumed by industry. This includes water used for manufacturing, energy production, and other industrial processes. Industries often require large amounts of water for cooling, processing, cleaning, and other operations. The high demand for water in industries highlights the need for efficient water management and conservation practices to ensure sustainable use of this vital resource.
9.
What kind of water is needed for agricultural use?
Correct Answer
A. Freshwater
Explanation
Freshwater is the type of water needed for agricultural use. Agriculture relies heavily on freshwater for irrigation to water crops, provide moisture to soil, and support livestock. Freshwater is crucial because most plants and animals cannot tolerate the high salt content found in saltwater. Groundwater, which is also mostly freshwater, can be used for agriculture as well, but the primary requirement is that the water lacks high concentrations of salt.
10.
What is irrigation?
Correct Answer
B. The process of bringing water to an area for use in growing crops
Explanation
Irrigation is the process of supplying water to land or crops to help growth, typically by means of channels, sprinklers, or other systems. It is essential in areas where rainfall is insufficient to meet the water demands of crops. By artificially supplying water, irrigation helps maintain landscapes, rehydrate soil during dry periods, and grow agricultural crops. This practice is crucial for food production and farming sustainability, especially in dry regions.
11.
What is one problem with overdraft?
Correct Answer
C. Both of the answers listed above
Explanation
Overdraft, or the excessive pumping of groundwater from aquifers, can lead to several significant problems. One major issue is the intrusion of saltwater into freshwater aquifers, which occurs when groundwater levels drop too low near coastal areas, allowing seawater to infiltrate. Another serious consequence is the sinking of bedrock, known as subsidence, which happens when large volumes of groundwater are removed, causing the ground above to collapse. Both of these impacts demonstrate the critical need for careful management of groundwater resources to prevent long-term damage to water supplies and infrastructure.
12.
What is desalination?
Correct Answer
A. The process by which salts are removed from the water
Explanation
Desalination is the process of removing salts and other minerals from saline water to produce fresh water suitable for human consumption or irrigation. This process is particularly crucial in areas where freshwater resources are scarce. Desalination can involve various technologies, most commonly distillation—where saltwater is heated until it evaporates, leaving the salt behind, and the vapor is then condensed back into liquid—and reverse osmosis, where water is forced through a membrane that filters out salts and minerals. This technology provides an essential source of fresh water from the sea or brackish water sources.
13.
What is freezing?
Correct Answer
C. When salt water is frozen and separates, forming an ice and brine slush; ice can be melted to obtain fresh water
Explanation
Freezing, in the context of water treatment, refers to the process where salt water is frozen, resulting in the separation of salt and water. This process creates a mixture of ice (which is mostly pure water) and a brine slush (which contains the concentrated salt). The ice can then be separated and melted down to produce fresh water. This method is used as a desalination technique to make salt water drinkable or usable for other purposes, utilizing the physical properties of water and salt under freezing conditions.
14.
What does unpotable mean?
Correct Answer
B. Unfit to drink
Explanation
The term "unpotable" refers to water that is not safe or suitable for drinking. This can be due to contamination with pollutants, chemicals, pathogens, or excessive minerals that make the water harmful to health. Unpotable water may still be used for other purposes such as irrigation or industrial processes, depending on the nature of the contaminants, but it must be treated or purified before it can be consumed safely by humans. Ensuring water is potable, or safe to drink, is essential for public health and well-being.
15.
What does screening do?
Correct Answer
A. Traps and removes large debris from water
Explanation
Screening is a process that involves the use of a physical barrier, such as a mesh or filter, to trap and remove large debris from water. This helps to prevent the debris from entering a system or body of water, ensuring that the water remains clean and free from any potential contaminants. By effectively removing large debris, screening helps to improve the overall quality of the water and maintain its usability for various purposes.
16.
Is chlorine a chemical that can be used in sterilization?
Correct Answer
A. Yes
Explanation
Yes, chlorine is a chemical widely used for sterilization purposes, particularly in water treatment. It acts as a disinfectant to kill bacteria, viruses, and other microorganisms that can cause disease. By adding chlorine to water, it helps ensure the water is safe to drink by eliminating harmful pathogens. This method is commonly employed in municipal water systems and swimming pools to maintain water quality and prevent the spread of waterborne illnesses.
17.
How are water resources renewed?
Correct Answer
A. Through the water cycle
Explanation
Water resources are renewed through the water cycle. The water cycle is a continuous process in which water evaporates from bodies of water, forms clouds, falls back to the earth as precipitation, and then flows into rivers and streams, eventually returning to the oceans. This cycle allows for the renewal and redistribution of water resources, ensuring a continuous supply of water for various uses such as drinking, agriculture, and industry.
18.
What is one type of use for water resources?
Correct Answer
A. Industrial
Explanation
Industrial use is one type of use for water resources. This refers to the use of water in various industries such as manufacturing, power generation, and agriculture. Industries require water for processes like cooling, cleaning, and as a raw material in their production. Water resources play a crucial role in supporting industrial activities and ensuring their sustainability.
19.
What happens when runoff gets caught in low places?
Correct Answer
A. It becomes standing water
Explanation
When runoff gets caught in low places, it becomes standing water. This situation arises because the low-lying areas naturally prevent the water from continuing its flow or draining effectively into the surrounding soil or sewer systems. As a result, the water accumulates and remains stagnant, unable to disperse or infiltrate. Over time, this standing water can form larger pools or widespread puddles. These areas of collected water are not only a potential breeding ground for mosquitoes and other pests but can also become a hazard for pedestrians and vehicles if not managed properly.
20.
Is freshwater more plentiful than groundwater?
Correct Answer
B. No
Explanation
The statement "Freshwater is more plentiful than groundwater" is incorrect. Groundwater actually makes up a significant portion of the Earth's fresh water available for use. While visible bodies of water like rivers and lakes are more apparent, they constitute a smaller volume compared to the vast amounts stored underground in aquifers. Groundwater is indeed more abundant than what we see on the surface as freshwater.