The Water Cycle

Introduction to the Water Cycle

Earth's Incredible Hydrosphere

Vocabulary

• Water Cycle

• Evaporation

• Transpiration

• Condensation

• Precipitation

• Run-off

How would you describe the Water Cycle?

Open Ended

Poll: Using your own words, type a sentence that describes the Water Cycle.

A giant, never-ending water recycling system!

Multiple Choice

What process does this image show?

• Condensation

• Transpiration

• Evaporation

• Precipitation

Open Ended

What word is found inside evaporation?

The word found inside 'evaporation"

• eVAPORation

• Evaporation

Liquid changing to a gas (water vapor)

Multiple Choice

Look at your forearm. What is found on the surface of human skin that allows sweat and oil to escape, helping you to cool off?

• sweat glands

• pimples

• acne

• pores

Multiple Choice

True or False? Plants also have "pores" on their leaves.

• True

• False

Plant pores = Stomata

Pores that open and close on a plant leaf.

When open, allow water vapor to exit and carbon dioxide to enter. 

Practice Finding Percentages

• Let's break this down!

• Per = For 

• "Cent" = a Latin word for 100 (100 cents)

• Percent = For every 100

A plant has 300 stomata per square mm. If 243 stomata are open, what percentage is this?

A plant has 300 stomata per square mm. If 243 stomata are open, what percentage is this?

Percentage is the "Part" over the "Whole." What number is the whole? (Hint: the largest number).

A plant has 300 stomata per square mm. If 243 stomata are open, what percentage is this?

What number is the part? (Hint: the smaller number).

A plant has 300 stomata per square mm. If 243 stomata are open, what percentage is this?

243 divided by 300 = ??

243 divided by 300 = 0.81

0.81 x 100 = 81% of the stomata on the leaf are open.

243 divided by 300 = 0.81

0.81 x 100 = 81% of the stomata on the leaf are open.

Multiple Choice

There are water droplets on the edges of this leaf. What causes a leaf to lose both liquid water and water vapor (gas)?

• Condensation

• Heat from the sun

• Transpiration

• Precipitation

• Transpiration

Transpiration

Plants take up water through their roots. When sunlight warms the leaf, stomata open. Water vapor escapes and cools the leaf. 

Open Ended

What are the two girls running through? One can think of plants like small _____________________.

Multiple Choice

You have just taken a shower and the glass is covered with tiny drops of water. Which phase change has caused this?

• Condensation

• Evaporation

• Precipitation

• Transpiration

When plants "sweat" water vapor

Open Ended

What is another term for thermal energy? (Hint: thermometer, thermos, and thermostat).

Thermal Energy = Heat Energy

The movement of molecules in a substance creates thermal energy.

The faster the molecules are moving, the more energy they have to give to surrounding particles.

Multiple Select

Which of these has the MOST thermal energy?

• Hot water

• Cold water

• Warm water

• Ice cubes

Multiple Select

Which of these has the LEAST thermal energy?

• Hot water

• Cold water

• Warm water

• Ice cubes

Multiple Choice

Look at the diagram. Which statement best describes the differences in hot and cold particles?

• The particles in the cold substance are further apart and have MORE energy than the hot substance.

• The particles in the hot substance are further apart and have LESS energy than the hot substance.

• The particles in the cold substance are closer apart and have LESS energy than the hot substance.

Multiple Select

What two things are required in order for condensation to occur?

• water vapor

• water

• cold temperatures

• warm temperatures

COLD temperatures turn water vapor (gas state of water) into liquid.

Multiple Choice

Tom made 24 snowballs. If he gave 10 snowballs to his best friend, what percentage of his snowballs did he give away?

• 60%

• 50%

• 42%

• 40%

______ (part - the snowballs Tom gave away) divided by ___ (total number of snowballs)

Multiple this quotient by 100 to get percentage

10 (part - the snowballs Tom gave away) divided by 24 (total number of snowballs)

Multiple this quotient by 100 to get percentage

Gas to a Liquid

Multiple Choice

What is the term for rain, sleet, snow and hail falling from a cloud?

• Precipitation

• Evaoporation

• Transpiration

• Perspiration

After heavy precipitation, some water does not soak into the soil; it flows over the land. This is called run-off.

Poll

Poll: We want to find the percentage of students in this class period who like broccoli. Please respond Yes or No: Do you like broccoli?

• Yes

• No

______ (part of the class that likes broccoli) divided by ___ (total number of students in the class).

Multiple this quotient by 100 to get percentage

Multiple Choice

What are water droplets that fall from the atmosphere in the form of rain, sleet, snow, or hail?

• Precipitation

• Perpetration

• Perspiration

• Percolation

Multiple Choice

What is the cooling of water in the atmosphere changing gas to a liquid?

• Evaporation

• Transpiration

• Condensation

• Precipitation

Multiple Choice

What is the process that occurs when water changes from a liquid to a gas, caused by heat?

• Condensation

• Evaporation

• Transpiration

• Precipitation

Multiple Choice

When water changes from a gas to a liquid, has thermal energy been added or removed?

• Added

• Removed

Multiple Choice

What are the changes to water when it evaporates into the air, condenses into clouds, and then precipitates down to Earth?

• Precipitation

• Evaporation

• Condensation

• Run-off

• Water Cycle

Multiple Choice

What is rainfall that is not absorbed by soil and travels to the ocean?

• Percolation

• Infiltration

• Run-in

• Run-off

Multiple Choice

If 97% of the water on Earth is salt water, what percentage of water on Earth is fresh water?

• Less than 4%

• 3%

• 1%

• 7%

Water Cycle Project

• Work in pairs or groups of 3 - 4

• Ideas for models: poster, Power Point presentation, video, diorama, or a story written for elementary students about a droplet's journey through the Water Cycle. Other ideas? 

• Done during class and outside of class (homework)

• Water Cycle Project Information and Rubric in Assignment

Water Cycle Project - Resources

What if I don't understand the processes?

• Flipped Classrooms and YouTube videos

• Quizzes.com - Water Cycle quizzes and Lesson Plans

• The notes you have taken in class

• Water Cycle Project Information and Rubric

• Encyclopedia Britannica article with hot links

• Your class mates; your teacher

• Your own Internet searches

Group Work Ground Rules

• Everyone has a turn to speak.

• Listen carefully to each other.

• Give reasons for your opinions.

• Respectfully disagree - no put downs allowed!

• If you have questions, one person should go to the main meeting and chat or ask me

Multiple Choice

103 students in your 6th grade class own a cell phone. If your class has a total of 150 students, what percentage of the class owns a cell phone?

• 87.1%

• 118%

• 84.6%

• Less than 50%

______ (part (smallest number) of the class that has a cell phone) divided by ___ (total number of students in the class).

Multiple this quotient by 100 to get percentage

Poll

Poll: We want to find the percentage of students in this class period who like playing basketball. Please respond Yes or No: Do you like to play basketball?

• Yes

• No

Multiple Choice

The National Weather Service reports that on average, 80% of the 50 states in the U.S. are receiving less snow than they did 100 years ago. How many U.S. states are receiving less snow?

• 10

• 25

• 40

• 55

If 80% of 50 states are receiving less snow than they did 100 years ago, how many states have less snow?

• Percentage = part divided by the whole

• What is 80% of 50? (replace "of" with "x" (multiplication sign)

• Number of states = 80% x 50

• Make 80% into a decimal (move the decimal 2 places (x 100) = 0.80

• 0.80 x 50 = 40 states receiving less snow