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Water Definition

Water is a clear liquid that cycles between clouds and the Earth's oceans and land. For example, we need water to drink.

View Lesson on Water Cycle (6-8 Version)
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Water Cycle (6-8 Version)

LESSON MATERIALSmove

Fun Facts

  • Water is always changing states between liquid, gas (vapor), and solid (ice).
  • Energy from the sun continually moves water through the water cycle.
  • The force of gravity pulls water down through the water cycle.

Why Do We Need To Know About Water

Learning about water helps you understand how important it is for our bodies, especially in very hot places like Death Valley where you need to drink a lot of water to stay healthy and alive. This shows how crucial water is for us.

Also, knowing about water can lead to jobs in fields like hydrology and meteorology. These experts work to keep our drinking water clean and forecast the weather to protect people from natural disasters. It’s also key to know about water to take care of the environment and make sure we have enough water for farming and drinking.

Frequently Asked Questions

How does heat from the Sun turn liquid water into a gas called water vapor?
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.
Explain how energy from the Sun drives the water cycle.
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.
How do plants contribute to the water cycle?
Water travels from the soil, through the plant, and then evaporates from the leaves into the atmosphere.
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