6 Did You Know…The amount of water on Earth has been the same for eons, however the form and state of water is constantly changing!The majority of the world’s freshwater is in ice caps at the North and South poles….So we have to get our water from springs, creeks, streams, rivers, lakes and oceans
7 Two Characteristics of Water Saltwater is found in oceansFreshwater is our primary source of drinking water
8 Good to Know! The Sun is the driving force of the Earth’s weather And the major source of energy which ALSO powers the water cycle is the Sun…but we will get to that tomorrow.
9 Where can we get our hands on this freshwater? ¾ Freshwater is Frozen Solidin ice caps and glaciers¼ Freshwater is Liquid undergroundA tiny fraction is in lakes & riversA smaller fraction is water vapor in the atmosphere
10 So… If we had a water bottle and filled it with 1000mL of water 972 mL would be in saltwater28mL would be freshwater
11 Then… Out of that 28mL of freshwater 23.5mL would be stuck frozen in ice caps and glaciers!4mL would be underground2mL would be in lakes and rivers1mL would be in the soil and air
12 Water never leaves the Earth Water never leaves the Earth. It is constantly being cycled through the atmosphere, ocean, and land. This process, known as the water cycle, is driven by energy from the sun. The water cycle is crucial to the existence of life on our planet.
15 During part of the water cycle, the sun heats up liquid water and changes it to a gas by the process of evaporation. Water that evaporates from Earth’s oceans, lakes, rivers, and moist soil rises up into the atmosphere.
19 As water (in the form of gas) rises higher in the atmosphere, it starts to cool and become a liquid again. This process is called condensation. When a large amount of water vapor condenses, it results in the formation of clouds.
20 You Know This! Think of it like when you take a shower The water is HOT (or warm)Thinking back to evaporation, we know when the water heats, it turns into a vapor and enters the atmosphereOnce this vapor hits your cooler mirror, it turns into a liquid again
24 When rain falls on the land, some of the water is absorbed into the ground forming pockets of water called groundwater. Most groundwater eventually returns to the ocean. Other precipitation runs directly into streams or rivers. Water that collects in rivers, streams, and oceans is called runoff.
26 Show Me You Understand! Some of you will receive a card. If you see your part of the water cycle happening, hold your card up and tell the class what it is with a definition.*Hint: evaporation and condensation happen quickly together*