Science 4: Water Cycle
Apologies in advance if you came here really excited about a bicycle you can ride on water. We get that a lot. This video is really about the cycle of states that water goes through. Which is still pretty cool too. Check it out.
|Elementary and Middle School||4th Grade|
Super duper old. [Photo of boy's Dad stamped]
That jar of licorice that has been on your Grandma's coffee table since you can remember?
Probably about as old as the dinosaurs. [Dinosaurs in a field]
But if you really want to see something truly old, all you have to do is turn on the tap
in your house.
Now that's old. [Water coming out of a tap]
Well, seeing as all of the water on Earth is the same water that's been on Earth since
the beginning of time, we'd say it's pretty old.
Which…seems kind of confusing, right? [Man sitting drinking an espresso]
After all, water seems to be changing all the time – we drink it, it evaporates, it
rains, it freezes, we turn it into snowballs and slushies and apple juice... how can the
water we have today be the same water from billions of years ago? [Water pours into a magicians hat]
Magic, That's how.
See, here's the thing: water is constantly changing forms, from a liquid to gas to solid
and back again.
But even in all those different forms, it never stops being water. [Coop discussing the different water forms]
After all, you could put on a clown costume, a cowboy costume, and a gorilla suit, and
you'd still be you.
All of this changing is referred to as the water cycle, and it has many different parts: [Dino teaching about the water cycle]
evaporation, condensation, precipitation, transpiration, run-off, and infiltration.
Huh, those last two make water sound like some sort of secret agent… [Man struggling to carry a large water bottle]
But that'd be ridiculous.
Even if water could infiltrate enemy territory, it wouldn't be able to tell us their secrets
…or could it…hm.
Someone should get the FBI on this… [Men standing in a room having a cup of water]
Anyway, while we call up the FBI, let's check out each step of the water cycle!
First up is evaporation, which occurs when water changes from a liquid to a gas. [Coop discussing evaporation]
Picture a puddle on the ground.
And then picture the hot sun above.
The solar energy from the sun causes the exposed water molecules from the puddle to turn into [Water turns into vapor]
water vapor, which rises up and forms clouds.
Nope, it's not something out of Harry Potter…it's an example of evaporation.
Next up is condensation, which is pretty much the exact opposite of evaporation.
That's because condensation is when water changes from a gas to a liquid. [Dino discussing condensation]
When the evaporated water molecules in clouds are cooled down enough to turn back into liquid
water droplets, then that's condensation. [Dark clouds and rain begins to fall]
And when that rain actually falls down from the clouds into the sky and back down to the
earth – whether it's as rain, snow, hail, or anything else - we call that precipitation.
Should've told you to bring an umbrella to this video… [Man standing in a field and soaked by rain]
But here's one you probably haven't heard of before... transpiration.
Transpiration occurs when water is evaporated from plants.
In other words, when water goes into the plants roots, it slowly travels up through the plant, [Water travelling up through a plant]
hydrating everything as it goes.
Eventually, this water reaches small pores on the underside of the plants leaves, where
it turns into vapor and is released out into the air to be evaporated.
And that's transpiration!
We bet your folks don't even know about that one.
But before water can even get into the plants roots, it has to soak into the ground first. [Water soaking into the ground]
And thankfully, there's a word for that: it's called infiltration.
Which explains why the FBI hung up on us when we called…
And if rain water falls to the ground and doesn't go into the ground, but instead runs
We've got a word for that too: run-off. [Coop discussing run-off]
Super clever name, right?
If precipitation hits the ground and “runs off” into a lake, a river or even a stinky
sewer, then you've got yourself some run-off.
All of these different processes are constantly happening, and they all make up the water cycle.
And it's because of them that we can say that the water here on Earth is some of the oldest [Water vapor]
Yup, even older than those funky old bell-bottoms your dad still keeps around for some reason. [Dad dancing in the living room]
Hm…maybe we can call the FBI and see if they could make those disappear…