Water on Earth The Water Cycle

The Science of the Water Cycle

3 States of Water Solid – ice Gas – Water Vapor Liquid -water

3 States of Water Solid- molecules packed together and vibrating very slowly Solid- molecules packed together and vibrating very slowly Middleschoolchemistry.com Ice animation

Liquid Molecules loosely packed and sliding past each other Molecules loosely packed and sliding past each other Middleschoolchemistry.com Compare a solid and a liquid animation

Vapor (gas) Molecules are spread far apart and moving fast Molecules are spread far apart and moving fast Middleschoolchemistry.com Comparing solid, liquid, gas animation

How does water change state? By adding or removing heat energy By adding or removing heat energy Add energy Add energy (think Energy In) (think Energy In) Remove energy Remove energy (think Energy Exits) (think Energy Exits) Heating and cooling of a solid animation Heating and cooling of a liquidmelting ice animation Heating and cooling of a gas

Changing States Is energy added or removed? Ice melting- energy is ________ Ice melting- energy is ________ Water freezing- energy is _________ Water freezing- energy is _________ Water boiling- energy is __________ Water boiling- energy is __________ Adding and removing energy Adding and removing energy

Where does this energy come from to change the state the water is in? This process is driven by the sun and its energy This process is driven by the sun and its energy

Water Cycle Water Cycle Video Water Cycle Video Water Cycle Video Water Cycle Video

What is the Water Cycle? The continuous movement of water into the air, onto land, and back into the air over and over again The continuous movement of water into the air, onto land, and back into the air over and over again Water Cycle

Water Cycle- Evaporation The sun heats up liquid water The sun heats up liquid water and turns it into water vapor (gas) Water vapor is invisible Water vapor is invisible The smoke we see is from the vapor condensing… Evaporation animation

Water Cycle- Transpiration Do plants sweat? Well, sort of.... people perspire (sweat) and plants transpire. Well, sort of.... people perspire (sweat) and plants transpire. Transpiration is the process by which plants lose water out of their leaves. Transpiration is the process by which plants lose water out of their leaves. Transpiration gives evaporation Transpiration gives evaporation a bit of a hand in getting the water vapor back up into the air.

Water Cycle- Condensation Water vapor in the air gets cold and changes back into liquid, forming clouds Water vapor in the air gets cold and changes back into liquid, forming clouds Condensation animation

Water Cycle- Precipitation The solid or liquid water that The solid or liquid water that Falls from the air to the surface -rain, snow, sleet, hail…

Water Cycle- Runoff Water that flows across land and collects in rivers, streams, and eventually the ocean Water that flows across land and collects in rivers, streams, and eventually the ocean

Water Cycle- Groundwater Water Waterlocated within the rocks below the Earths surface

Changing states in the Water Cycle Evaporation- energy is_________ Evaporation- energy is_________ Condensation- energy is __________ Condensation- energy is __________ Transpiration- energy is ___________ Transpiration- energy is ___________

Water Everywhere! Water is MATTER. -What is matter? It has Mass and Volume.

Conservation of Matter Water cannot be created, nor destroyed. It cycles. It changes state (remember the 3 phases- solid, liquid, gas) it never decreases or increases in total amount. We do not have more or less water now than we did millions of years ago!! The Water Cycle just keeps going, and going, and going, and going……

More examples of Conservation of Matter Rock cycle Rock cycle Weathering/Erosion/Deposition Weathering/Erosion/Deposition Plate tectonics Plate tectonics