Do Now: The glass of water you’re about to drink Deserves a second thought, I think. For Avogadro, oceans and those you follow Are all involved in every swallow. The molecules of water in a single glass In number, at least five times, outclass The glasses of water in stream and sea, Or wherever else that water can be. The water in you is between and betwixt, And having traversed is thoroughly mixed, So someone quenching a future thirst Could easily drink what you drank first! The water you are about to taste No doubt represents a bit of waste From prehistoric beast and bird— A notion you may find absurd. The fountain spraying in the park Could well spout bits of Joan of Arc, Or Adam, Eve, and all their kin; You’d be surprised where your drink has been! Just think! The water you cannot retain Will some day hence return as rain, Or be held as the purest dew. Though long ago it passed through you! Written by Verne N. Rockcastle

Homework packet due on Friday Announcements

Wrapping up stations from yesterday. Water cycle game Agenda

We need to understand that every drop of water on the planet has been here since its’ beginnings. Water cycle is never ending and is constantly recycling. Why?

Ozone Stations Stay on task. You’ll have about 20 minutes to wrap these up. Ozone Stations

In your pairs, talk about the conditions that cause water to move from one location in the water cycle to another. Water movement depends on energy from the sun and gravity. Sometimes water will not go anywhere. How does water move? Most movement occurs when the water is in the water vapor form. How does water travel?

You’re going to become water molecules moving through the water cycle. Around the room, you will see station labels and dice. You will see that on the station labels that there is a number attached to it. When it is your turn, you will roll the dice and then go to the station number that you rolled. Water cycle game

In order to roll, you must first line up single file. When I tell you to, the first person will roll. If you travel to the next station as a liquid, then you will take the person behind you in line and you will move as a pair. If you move as a vapor, then you will move alone. If you roll a stay, then go to the back of the line and stay at the location.

Some Questions to Ponder…. Do we have more or less water than 1,000 years ago? Where does water go after it rains? How much water is there on Earth? Some Questions to Ponder….

Do We Have More or Less Water Than 1,000 Years Ago? Actually, we have always had the EXACT same amount of water. In fact, we have the SAME water as forever ago! That means we’re drinking the same water that the dinosaurs drank! Do We Have More or Less Water Than 1,000 Years Ago?

What is the water cycle?

In very simple terms, the water cycle is the journey that water takes from land to the sky and back again! What is the water cycle?

Let’s start with evaporation What is evaporation? - Evaporation is the process of water molecules changing from a liquid state to a gas state - This gas state of water is called water vapor * The sun’s heat causes evaporation from streams, rivers and oceans Let’s start with evaporation

Transpiration is the process of water being evaporated from the leaves and stems of plants * Try this at home: Place a plastic bag over part of a potted plant at home. Place it out in the sun for a day. Take the bag off. Do you think the bag will be wet or dry? Why? Transpiration

Does water have to be a liquid before it can evaporate? No, sometimes in special cases, water can change from being a solid into a gas directly (no melting!) This is called sublimation Does water have to be a liquid before it can evaporate?

What happens to the water vapor once it evaporates into the air? Condensation is the process of water changing from a gas (water vapor) back to its liquid form Clouds are made from condensed water droplets Condensation is also what causes your glass of lemonade to “sweat” What happens to the water vapor once it evaporates into the air?

“When it rains, it pours…” When condensed water vapor starts to build up in clouds, eventually the millions of tiny droplets start to combine and get too heavy for the clouds These droplets fall as precipitation Precipitation includes rain, snow, sleet and hail “When it rains, it pours…”

Where does all that precipitation go? As precipitation falls, much of it seeps into the ground This is called infiltration Where does all that precipitation go?

So how is it a cycle? Because these processes never stop. For example, after infiltrating into the groundwater, water may flow into a stream where water can be evaporated once more! So how is it a cycle?