Water Cycle
Water is cycled EVERYWHERE.

Water is found in all living things.  In addition, 71% of the earth’s surface is covered by water.  Therefore, one can imagine that water cycles back and forth between different organisms and their environment, and we call this process the Water Cycle.

20170524 Water Cycle
(Click to Enlarge)

The above drawing is actually an oversimplified illustration of the water cycle, and the actual water cycle is far more complex. For example, inside this drawing you can see a horse and some grass next to it.  When the horse eats the grass, the water in the grass moves into the horse!

Water cycle is really the easiest cycle to understand because we SEE it happen with our own eyes, everyday.  When it rains, we know that water is moving from the sky to the ground.  In the contrary, when a puddle of water dries up, we know that its water has moved from the ground back up to the air again.

Next Generation Science Standards:

MS-LS2-1. Analyze and interpret data to provide evidence for the effects of resource availability on organisms and populations of organisms in an ecosystem.

MS-LS2-3. Develop a model to describe the cycling of matter and flow of energy among living and nonliving parts of an ecosystem.

MS-LS2-4. Construct an argument supported by empirical evidence that changes to physical or biological components of an ecosystem affect populations.


HS-LS2-3. Construct and revise an explanation based on evidence for the cycling of matter and flow of energy in aerobic and anaerobic conditions.

HS-LS2-4. Use mathematical representations to support claims for the cycling of matter and flow of energy among organisms in an ecosystem.

HS-LS2-5. Develop a model to illustrate the role of photosynthesis and cellular respiration in the cycling of carbon among the biosphere, atmosphere, hydrosphere, and geosphere.

What Science Does this Comic Teach?

Unit: Ecology

⇒Chapter: Cycles of Matter

⇒Topic: Water Cycle

Additional Information


Transpiration describes a situation when moisture escapes from a living organism’s *body-surface to the environment (* such as the skin, eyes, and mouth…etc.).  Transpiration is always connected to “living organisms”.


Evaporation is simply describing a body of liquid water slowly escape into the air in the form of water vapor.  To the human eyes, we perceive it as the puddle of water “dries up” when, in reality, it simply turns into a different form (gaseous water vapor).

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