Water Cycle Concept Map

Transpiration is the process by which plants lose water vapor from their leaves, mainly through tiny openings called stomata. This process helps pull water upward from the roots through the plant, carrying minerals along with it, and also helps cool the plant.

Precipitation is any form of water that falls from the atmosphere to the Earth’s surface, including rain, snow, sleet, and hail. It is a key part of the water cycle because it returns water from clouds back to land and oceans.

Condensation is the process where a gas changes into a liquid. A common example is water vapor in the air turning into droplets on a cold glass or dew on grass in the morning.

Evaporation is the process where a liquid changes into a gas or vapor. This happens when molecules at the surface of the liquid gain enough energy to escape into the air. It can occur at temperatures below the boiling point.

Runoff usually refers to water that flows over the land surface instead of soaking into the ground, often after rain or snowmelt. It can collect in streams, rivers, and storm drains.

The water cycle is not a single loop but many overlapping cycles operating at different scales, from a puddle evaporating in minutes to groundwater moving over thousands of years.

Plants play a major role in the cycle through transpiration, releasing huge amounts of water vapor into the atmosphere. In some regions, this can rival or exceed evaporation from soil and water surfaces.

The water cycle helps regulate climate by moving latent heat around the planet, especially when water evaporates and later condenses in clouds and storms. The release of heat during condensation powers storms and influences atmospheric circulation.

Human activities such as deforestation, irrigation, urbanization, dam construction, and groundwater pumping can significantly alter evaporation, runoff, and rainfall patterns, affecting water availability and quality.