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Mr. Harper’s science mini- lesson with read-along audio. /. The Water C ycle. /. /. Click on the speaker icons to hear the spoken words. All water is made of tiny, tiny particles called molecules , way too small to see. several ways to draw water molecules.
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Mr. Harper’s science mini- lesson with read-along audio / The Water Cycle / / Click on the speaker icons to hear the spoken words
All water is made of tiny, tiny particles called molecules, way too small to see. several ways to draw water molecules
When these molecules get cold they slow down and freezesolid. Frozen water is called ice and can be like rock.
If ice gets warmer it melts and becomes liquid. The molecules move faster and begin to slip and slide past each other.
The molecules in a liquid substance can slide by each other and change shape.
This is why liquid water changesshape so easily and can go through small places.
As liquid water gets warmer the molecules begin to float up and away from the liquid and become gas (part of the air).
The molecules in a gas substance float and stay apart from each other.
Water molecules in the air are called vapor. The process when liquid water changes into vapor is called evaporation.
Evaporation is what happens when water in an open container seems to disappear after a few days.
When the temperature gets hotter, evaporation happens faster. That’s why a wet sidewalk gets dry quickly when the sun comes out. Heat is what makes water evaporate.
We can’t see water vapor in the air because it’s invisible, but it’s always there as part of the air around us.
About 75% of Earth’s surface is covered by ocean water.
Every day as the sun warms the oceans, many tons of water molecules evaporate and become gas vapor in the atmosphere. / / / / Heat is what makes water evaporate.
Water vapor high in the sky can cool and condense into tiny floating droplets of liquid water. Large groups of liquid droplets are what clouds are made of.
The clouds and vapor are blown by winds all over Earth. Some of it moves over land.
When clouds get colder the dropletsget bigger. This makes the clouds look darker.
When the droplets in clouds get too big and heavy to float they fall to the ground as rain.
Some of the rain that falls soaks into the soil to give water to the trees and plants.
Some rain water seeps deep underground and collects as groundwater that people can get when they dig a well.
When it gets really cold, rain turns into snow. Sometimes snow and ice can lay on the ground for a long time. /
Rain that doesn’t soak into the ground, or freeze into ice and snow will run down hill toward the ocean.
Streams flow together and get bigger as they move toward the ocean.
This runoff water keeps moving downhill until it flows into the ocean.
The sun warms the ocean and the watercycle keeps going, just like it has for billions of years.
Every water molecule on Earth has gone around this Water Cycle many, many times in the past. vapor
You can learn more about The Water Cycle onBrainpopandBrainpop junior If you are a 4th of 5th grader, or a younger student who really likes science, this program continues. Just keep clicking.
There are four steps of the Water Cycle that we should all know. • evaporation • condensation • precipitation • runoff
Evaporationis when liquid water that has been warmed by the sun evaporates and becomesvapor, a gas in the air. • evaporation • condensation • precipitation • runoff
Condensation is when water vapor cools and becomes liquid. Clouds are masses of liquid water droplets that are light enough to float.
You can see condensation on a cold soda can when the air near the can gets cool and the vapor in that air turns to liquid.
When clouds get cooler, the droplets condense into bigger drops. When the condensation gets too heavy to float, it will fall to the ground.
Precipitation is when water falls from the sky. If it is warm enough to be liquid, we call it rain.
When the air is colder the precipitation freezes and becomes snow.
Sometimes cold precipitation falls as beads of ice called sleet.
Sometimes precipitation gets blown by updrafts up high where the air is very cold. Balls of ice get bigger as the wind pushes them up.
When the ice balls fall they are called hail. Big hail stones can be very dangerous.
Runoff is the water that runs downhill. Sooner or later the ice and snow melt. Any precipitation water that doesn’t soak into the ground or get used by plants and animals runs downhill toward the ocean as runoff.
Runoff streams join together until they form huge rivers that flow into the ocean.
The Water Cycle keeps going around and around. The cycle never stops.
By the time you are a 5th grader, you should know the four steps of the Water Cycle….
By the time you are a 5th grader, you should know the four steps of the Water Cycle…. Liquid water becomes part of the air • Evaporation • Condensation • Precipitation • Runoff
By the time you are a 5th grader, you should know the four steps of the Water Cycle…. • Evaporation • Condensation • Precipitation • Runoff Water vapor cools and becomes liquid.
By the time you are a 5th grader, you should know the four steps of the Water Cycle…. • Evaporation • Condensation • Precipitation • Runoff Water droplets get heavy and fall. Rain, snow, sleet. hail
By the time you are a 5th grader, you should know the four steps of the Water Cycle…. • Evaporation • Condensation • Precipitation • Runoff Water flows backto the ocean.
Wow, you just learned a lot about The Water Cycle! You must really be interested in science. But if you want even more science…… …just keep on clicking that mouse
