Notes 6 – THE WATER CYCLE Mrs. Gordon Earth Science Saturday, January 23, 2016Saturday, January 23, 2016Saturday, January 23, 2016Saturday, January 23, 2016

Water cycle - water moves from bodies of water, land, and living things on Earth’s surface UP to the atmosphere and back DOWN to Earth’s surface. Water cycle - water moves from bodies of water, land, and living things on Earth’s surface UP to the atmosphere and back DOWN to Earth’s surface. ~ MAIN ENERGY SOURCE = the SUN ~ MAIN ENERGY SOURCE = the SUN

Main Terms of the Water Cycle: Evaporation – when water molecules absorb energy and change from a liquid into a gas. Evaporation – when water molecules absorb energy and change from a liquid into a gas. Condensation – when water vapor cools and condenses back into liquid = clouds Condensation – when water vapor cools and condenses back into liquid = clouds Precipitation – water that falls to Earth from the atmosphere. The source of ALL of Earth’s fresh water. Precipitation – water that falls to Earth from the atmosphere. The source of ALL of Earth’s fresh water.

A few more: Transpiration – plants absorb water from the soil and release it into the atmosphere through their leaves Transpiration – plants absorb water from the soil and release it into the atmosphere through their leaves Run-off – when water flows back into the ocean. Run-off – when water flows back into the ocean. Groundwater – water that soaks into the ground and becomes trapped in porous rock (like a sponge). Groundwater – water that soaks into the ground and becomes trapped in porous rock (like a sponge).

Main Uses for water: 1. Agriculture 1. Agriculture 2. Industry / Energy 2. Industry / Energy 3. Transportation 3. Transportation 4. Recreation 4. Recreation 5. Survival of living things 5. Survival of living things

Fun water facts….. ~ 97% of all water on Earth is salty! ~ 97% of all water on Earth is salty! ~ Only 3% of Earth’s water is fresh water ~ Only 3% of Earth’s water is fresh water 2% is frozen 2% is frozen 1% is liquid fresh water!! 1% is liquid fresh water!! ~ You are made of about 65% water! ~ You are made of about 65% water!

Add a neat, labeled water cycle diagram to page. Add a neat, labeled water cycle diagram to page.

What is the water cycle? The water cycle describes the existence and movement of water on, in, and above the Earth. Earth's water is always in movement and is always changing states, from liquid to vapor to ice and back again. The water cycle has been working for billions of years and all life on Earth depends on it continuing to work. The water cycle describes the existence and movement of water on, in, and above the Earth. Earth's water is always in movement and is always changing states, from liquid to vapor to ice and back again. The water cycle has been working for billions of years and all life on Earth depends on it continuing to work. Because of the nature of water movement, a water molecule may be used over and over again throughout the centuries. The water you drink today could have dribbled down the back of dinosaur, been locked in a glacier during the last ice age, spent 30,000 years in the ocean depths, or floated in a cloud over ancient Egypt! Because of the nature of water movement, a water molecule may be used over and over again throughout the centuries. The water you drink today could have dribbled down the back of dinosaur, been locked in a glacier during the last ice age, spent 30,000 years in the ocean depths, or floated in a cloud over ancient Egypt! Where does all the Earth’s water come from? Primordial Earth was an incandescent globe made of magma, but all magmas contain water. Water released by magma helped cool down the Earth’s atmosphere, until it could exist on the surface as a liquid. Where does all the Earth’s water come from? Primordial Earth was an incandescent globe made of magma, but all magmas contain water. Water released by magma helped cool down the Earth’s atmosphere, until it could exist on the surface as a liquid.

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