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Water Cycle (6-8 Version)

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- Water on Earth is millions of years old and is constantly being recycling.
- Water cycles through the processes of evaporation, condensation and precipitation.
- The water cycle is driven by gravity and energy from the sun.
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Discussion Questions
- Before VideoWhat are some ways water moves on Earth’s surface?ANSWER
Water flows down rivers and streams and is collected in lakes, oceans, and other water reservoirs. Water can also flow and be stored underground.
Water can evaporate into the air as water vapor and then condense and fall as rain, hail or snow. Clouds and fog also store and move water in the atmosphere.
The ocean stores the largest amount of the water on Earth’s surface. Large amounts of water from the ocean also evaporate into the atmosphere.
Gravity pulls rain and snow down to Earth from the atmosphere through a process called precipitation. Gravity also pulls water from elevated areas such as mountains and hills down into lakes, oceans, and water reservoirs.
The Sun’s energy heats water, causing the water to evaporate into a gas called water vapor.
Water can evaporate at many different points in the water cycle. It can also be taken in by plants and animals and moved or deposited in various locations. Water might be pulled down from mountains to flow into rivers by gravity or moved underground. Wind will move rain and clouds in the atmosphere, creating many different locations for water to fall as precipitation. All of the processes that move water in the water cycle can occur in various locations on Earth and on different time scales.
- After VideoHow does heat from the Sun turn liquid water into a gas called water vapor?ANSWER
The energy from the Sun increases the energy of the water molecules when they are heated. This causes the water molecules to vibrate or move faster until some of them escape to become water vapor.
The Sun’s energy evaporates water into the atmosphere from all types of sources, including bodies of water, plants, and animals. This water eventually falls back to Earth and moves along Earth’s surface until it is evaporated again by the Sun. The energy from the Sun is a driving force that gets the water cycling in and out of the atmosphere.
Water travels from the soil, through the plant, and then evaporates from the leaves into the atmosphere.
When water vapor in the air loses heat or thermal energy to the atmosphere, the gas loses energy and changes its state to a liquid through a process called condensation. These tiny liquid water droplets are what form clouds.
Snowflakes form in cold temperatures when water vapor or water droplets begin to crystalize into solid water or ice. They can continue to grow bigger when more ice crystals are added until they eventually fall to Earth.
Water molecules today have been continuously cycling on Earth for millions of years. The same processes of evaporation, precipitation, and condensation that are happening today have been happening for millions of years
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Vocabulary
- Evaporation DEFINE
The process by which water changes from a liquid to a gas or vapor.
- Precipitation DEFINE
The process of water being released from clouds in the form of rain, hail or snow.
- Condensation DEFINE
The process of water vapor turning into liquid water.
- Gravity DEFINE
The force of attraction between two objects because of their masses.
- Sun Energy DEFINE
Energy produced or radiated by the Sun.
- Groundwater DEFINE
Water beneath the surface of the ground.
- Water Vapor DEFINE
The gaseous phase of water.
- Water Droplets DEFINE
The liquid phase of water.
- Crystallization DEFINE
The process by which solids form.
- Evaporation DEFINE
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Reading Material
Download as PDF Download PDF View as Seperate PageWHAT IS THE WATER CYCLE?The water cycle is the path that all water follows as it moves around Earth in different states. Liquid water is found in oceans, rivers, lakes, and underground. Solid water is found as snow or ice. The gaseous form of water is found as water vapor in Earth’s atmosphere.
To better understand the water cycle…