8U4L1 Hydrologic (Water) Cycle

8U4L1 Hydrologic (Water) Cycle

7.MS-ESS2-4. Develop a model to explain how the energy of the Sun and Earth’s gravity drive the cycling of water, including changes of state, as it moves through multiple pathways in Earth’s hydrosphere.

What do you remember about phases of matter?

Multiple Choice

Molecules in a liquid look like:

Multiple Choice

Molecules in a solid look like:

Multiple Choice

Molecules in a gas look like:

Multiple Choice

In what state of matter, do particles move so fast they cannot be held together?

• Solid
• Liquid
• Gas

Multiple Choice

Which arrow shows evaporation?

• 1

• 2

• 3

• 4

Multiple Choice

Which arrow shows freezing?

• 1

• 2

• 3

• 4

Multiple Choice

Which arrow shows condensation?

• 1

• 2

• 3

• 4

Multiple Choice

Which arrow shows melting?

• 1

• 2

• 3

• 4

Multiple Choice

The phase change from water vapor to liquid water is known as...

• evaporation
• precipitation
• condensation
• sublimation

Multiple Choice

When heat is added to a liquid, what occurs?

• Liquid molecules begin to condense to form a solid.

• Liquid molecules are being slowed down to become a gas.

• Liquid molecules speed up and begin to spread out to become a gas.

• Liquid molecules begin to slow down to become a solid.

Easy stuff, right?

Today we will learn about the Hydrologic Cycle

• It is also known as the Water Cycle

• It is the process that circulates water through the earth's atmosphere, land, and oceans

• It involves a specific set of processes: Water storage, evaporation, transpiration, condensation precipitation, and infiltration/runoff.

• The energy that drives this cycle is the SUN!

Water Storage

• Water is stored in lakes, oceans, and underground as groundwater.

• Frozen water is stored in glaciers and as snow

• The ocean stores 96.5% of the earth's water!

• Water is also stored and moved around the globe in the atmosphere.

Multiple Choice

How much of the earth's water is stored in the oceans?

• 96.5%

• 50%

• 99.9%

• 95%

Evaporation

• When water warms (because of the sun) then it evaporates into the air

• Evaporation is the change from liquid water to gas water.

• 90% of the water in the atomsphere evaporates from rivers, lakes, seas, and oceans.

Multiple Choice

Evaporation occurs when liquid water changes into

• transpiration

• snow

• solid

• vapor

Transpiration

• This is the water loss from the leaves of plants.

• Water travels through the plants and evaporates from the leaves.

• This is similar to how humans sweat and it evaporates!

Multiple Choice

What is transpiration?

• Excess water being released from the aerial parts of plants in the form of water vapor

• Excess sugar being released from the leave

• The way a plant makes its food

• When the plant uses sugar for energy

Condensation

Now that all this water that we can't see has been evaporated into the air, when it cools and condenses into clouds

Multiple Choice

Condensation involves a change of state from ___ to ___

• Liquid to Solid

• Liquid to Gaseous

• Solid to Liquid

• Gaseous to Liquid

Precipitation

• Once enough water condenses in the clouds, it falls to the ground in precipitation.

• Precipitation can be rain, snow, sleet, hail, or other forms of water falling to the ground!

Multiple Choice

What is precipitation?

• solids falling from the sky

• condensation to make clouds

• any form of water that falls from clouds and reaches earth's surface

• liquids falling from the sky

Infiltration

• Some of the water from precipitation or ice/snow melt goes into the ground.

• Water infiltrates into the ground and is stored as groundwater or in aquifers

Runoff

• Lastly - water that doesn't get absorbed into the ground moves along the ground into the collection areas

• This is also called "Collection"

• This is often rivers or streams, but can also be the underground flowing of water.

Multiple Choice

What happens during the water cycle?

• Water changes into different forms and is reused over and over again

• Water only turns to vapor and disappears when it becomes a cloud

• The Sun's light provides water to the plants

Reminder:

• The sun drives the cycling of water through the atmosphere.

• Water continually flows through the hydrologic cycle

Open Ended

Think about it - is there more, less, or the same amount of water on the earth as there was 1000 years ago? Explain your answer

There is the same amount of water now as 1000 years ago!

In fact, the water has been cycling for so long that we are drinking the same water the dinosaurs drank!

Let's See What We Have Learned!

Multiple Choice

What happens during the water cycle?

• Water changes into different forms and is reused over and over again

• Water only turns to vapor and disappears when it becomes a cloud

• The Sun's light provides water to the plants

Multiple Choice

What part of the hydrologic cycle is A?

• Evaporation

• Condensation

• Precipitation

Multiple Choice

What part of the hydrologic cycle is B?

• Evaporation

• Condensation

• Precipitation

Multiple Choice

What part of the hydrologic cycle is C?

• Evaporation

• Condensation

• Precipitation

Multiple Choice

What energy source creates water vapor into the air from rivers and lakes?

• The Sun

• The Clouds

• percolation

• The mountains

Multiple Choice

Water that flows beneath the Earth's surface.                          

• groundwater flow                            
• precipitation
• surface water flow
• flood 

Multiple Choice

Last Question! Forms of water falling from the sky as rain, sleet, hail, and snow.

• condensation

• transpiration

• precipitation

• surface run off

Hydrologic Cycle Vocabulary

• Aquifer - a layer of rock or sediment that stores water

• Evaporation - the process by which liquid water changes into water vapor

• Condensation - the process by which water vapor changes into liquid water, usually on a surface

• Groundwater - water stored below Earth’s surface

• Hydrologic Cycle (water cycle) - the repeating cycle of condensation and evaporation of water on Earth, causing clouds and precipitation

Hydrologic Cycle Vocabulary

• Infiltration - the process by which water on the ground surface enters the soil

• Precipitation - rain, snow, sleet, or hail that falls to the ground

• Runoff - excess water that drains away from land or buildings

• Sublimation - the process by which solid water changes into water vapor

• Transpiration - the process by which water travels through plants and releases as water vapor