Is Water An Element?

Explanation
Water is made up of two elements, oxygen and hydrogen. Oxygen and hydrogen atoms combine to form water molecules through a chemical reaction. Oxygen is a highly reactive element that readily bonds with other elements, while hydrogen is the lightest and most abundant element in the universe. When these two elements react, they form water, which is essential for life and has many important properties and uses.

Explanation
Approximately 70% of the Earth's surface is covered by water. This includes the oceans, seas, lakes, and rivers. The remaining 30% is land. Water is essential for sustaining life on Earth and plays a crucial role in regulating the planet's climate and supporting various ecosystems.

Explanation
The Nile River is the correct answer because it is widely recognized as the longest river on Earth. It spans across multiple countries in northeastern Africa, including Egypt, Sudan, Ethiopia, and Uganda. The Nile River has a total length of approximately 6,650 kilometers (4,130 miles) and has played a significant role in the development of ancient civilizations, such as the Egyptian civilization. It is also a vital water source for agriculture and supports a diverse ecosystem along its course.

Explanation
The human body requires approximately 3 to 4 liters of water per day. This amount is necessary for various bodily functions such as digestion, absorption, circulation, and maintaining body temperature. Water is essential for keeping the body hydrated, flushing out toxins, and lubricating joints. It is also important for maintaining healthy skin and promoting overall well-being.

Explanation
The correct answer is 8 to 10 days. This is because the human body can typically survive for about 8 to 10 days without water, depending on various factors such as temperature, physical activity, and individual health. Water is essential for the body's proper functioning, and without it, dehydration sets in, leading to severe health complications. However, it is important to note that this is a general estimate, and individual survival times may vary.

Explanation
Steam is the gaseous form of water. When water is heated to its boiling point, it undergoes a phase change and turns into steam. Steam is composed of water vapor, which is a gas. It is invisible and has the ability to expand and fill the space it occupies.

Explanation
Freshwater is more acidic compared to saltwater because it has a lower pH value. The pH scale ranges from 0 to 14, with 7 being neutral. Freshwater typically has a pH value below 7, indicating acidity, while saltwater has a pH value above 7, indicating alkalinity. This difference in acidity is due to various factors, such as the presence of dissolved carbon dioxide and organic acids in freshwater. Additionally, human activities such as pollution can further contribute to the acidity of freshwater bodies.