Do You Know Your Water?

Explanation
A dairy cow must drink approximately 4 gallons of water in order to produce one gallon of milk. This is because cows require a significant amount of water to maintain their overall health and milk production. Water is essential for digestion, nutrient absorption, and milk synthesis in cows. Therefore, a cow needs to consume a large amount of water to produce a relatively smaller amount of milk.

Explanation
Approximately 80% of the Earth's surface is covered in water. This includes oceans, seas, lakes, rivers, and other bodies of water. The remaining 20% is made up of land, including continents and islands. The large amount of water on Earth is essential for supporting life and regulating the planet's climate.

Explanation
A dripping faucet wastes a significant amount of water over time. If we assume that the faucet drips at a rate of one drop per second, it would waste approximately 5 gallons of water per day, which adds up to 1,825 gallons per year. However, if the dripping rate is higher or the faucet is left unattended for longer periods, the amount of wasted water could be even higher. Therefore, the correct answer of 2,000 gallons accounts for these variables and represents a reasonable estimate of the water wasted by a dripping faucet in a year.

Explanation
A person can live without water for approximately 1 week. Water is essential for the body's normal functioning and dehydration can lead to severe health complications. The human body can only survive for a limited time without water as it is needed for various bodily functions such as digestion, circulation, and temperature regulation. Without an adequate water supply, the body becomes dehydrated, which can result in organ failure and ultimately death. Therefore, it is crucial to consume enough water to maintain proper hydration and ensure the body's survival.

Explanation
The average person uses over 100 gallons of water each day. This includes water used for drinking, cooking, bathing, flushing toilets, washing clothes, and other household activities. Additionally, water is also used indirectly in the production of food, goods, and services that we consume daily. Therefore, when considering both direct and indirect water usage, the amount of water used by an individual on a daily basis exceeds 100 gallons.

Explanation
On average, brushing your teeth without leaving the water running uses approximately 2 gallons of water each day. This amount may vary depending on factors such as the duration of brushing and the type of toothbrush used. However, 2 gallons is a reasonable estimate for the amount of water typically used for this activity.

Explanation
The correct answer is H2O. This is the chemical formula for water, which consists of two hydrogen atoms bonded to one oxygen atom.

Explanation
The correct answer is 2-7 gallons. This is because older toilets typically use around 7 gallons of water per flush, while newer models are designed to be more water-efficient and use around 2 gallons. The amount of water used can also depend on factors such as the size of the toilet bowl and the type of flushing mechanism.

Explanation
The average five-minute shower uses approximately 15-25 gallons of water. This is a reasonable range as it takes into account factors such as water pressure and flow rate. Showers typically use less water compared to other household activities such as washing clothes or dishes. However, it is important to be mindful of water consumption and consider ways to conserve water, such as using low-flow showerheads or taking shorter showers.

Explanation
One gallon of gasoline can contaminate a large amount of water. The answer of 750,000 gallons suggests that the contamination caused by one gallon of gasoline can spread and affect a significant volume of water. This highlights the importance of preventing gasoline spills and properly managing and disposing of gasoline to protect the environment and water sources.