Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
The Water Cycle, also known as the Hydrological Cycle, is the continuous movement of between the Earth's surface and the atmosphere.
Evaporation: The process where liquid is heated by the Sun and turns into water vapor (gas).
Transpiration: A biological process where plants release excess into the atmosphere through tiny pores in their leaves called stomata.
Condensation: The process where water vapor cools down high in the atmosphere and turns back into tiny liquid droplets to form clouds ().
Precipitation: When the water droplets in clouds become too heavy, they fall back to Earth as rain, snow, sleet, or hail.
Infiltration and Collection: Rainwater flows into rivers, lakes, and oceans (collection) or soaks into the soil to recharge groundwater (infiltration).
Rainwater Harvesting: A conservation technique where rainwater is collected from rooftops and stored for future use or used to recharge groundwater levels.
📐Formulae
💡Examples
Problem 1:
During a hot summer day, a puddle of on the road disappears after a few hours. Name the process involved and explain why it happens faster when the temperature is high.
Solution:
The process is Evaporation.
Explanation:
Evaporation is the change of from liquid to gas. As the temperature increases, the molecules of water gain more kinetic energy, allowing them to escape into the air as vapor more rapidly.
Problem 2:
A student notices droplets forming on the outer surface of a glass filled with ice-cold water. Is this part of the water cycle? Explain.
Solution:
Yes, this demonstrates Condensation.
Explanation:
The water vapor present in the surrounding air comes into contact with the cold surface of the glass. The loss of heat energy causes the vapor to turn back into liquid droplets, mimicking how clouds form in the atmosphere.
Problem 3:
If a locality receives of rainfall annually but faces water scarcity in summer, what conservation method should be adopted?
Solution:
Rainwater Harvesting.
Explanation:
Rainwater harvesting allows the collection of during the rainy season to be stored in tanks or used to replenish the underground water table, ensuring availability during dry months.