Water on Earth

Water on Earth

​Objectives

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​1. Explain how water is distributed on Earth

​2. Identify the different parts of the Hydrological Cycle ( Water Cycle )

​3. Explain what takes place at each step of the Hydrological Cycle

​4. Discuss what happens to water once it returns to Earth

Open Ended

Why is Earth the only planet known that can sustain life?

Poll

Approximately what percentage of Earth do you believe is covered with Water ?

• 90

• 30

• 70

• 25

Water on Earth 

• Earth is called the Blue Planet 

• Approximately 70 % of Earth is covered with Water 

State of Water 

Solid : Ice , snow , sleet

​

Liquid : Rain 

​

Gas : Vapor ​

​

• The part on Earth that water occupies is called the Hydrosphere

• The Part on Earth where living things is called Biosphere 

• The air around Earth is called the Atmosphere

• The ground or the solid part of Earth is called Geosphere

Multiple Choice

Approximately what percentage of Earths surface is covered with water ?

• 67 %

• 70 %

• 30%

• 25%

Multiple Choice

What percent of Earth's water is fresh ?

• 90

• 10

• 3

• 97

Multiple Choice

What percent of Earths water is salted ?

• 90

• 10

• 97

• 3

Water distribution on Earth 

• 97% of Earths water is salted 

​

• 3% is fresh 

• 2% of the freshwater found on Earth is frozen in Glacier

​

• Only 1% is available for us as humans to use

•  DEMO

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Question : If only 1% of  freshwater is available for humans to use  what does that mean for us ?

• Amount of freshwater will be limited as population increases

• As population increases the tendency for water to become polluted also increases

• Finding ways to conserve water becomes very important ( Reduce , Reuse , Recycle)

• This is where Science becomes very important

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Poll

How has the amount of water over time changed ?

• Reduced

• Stay the same

• Increased

• The amount of water on Earth has not changed over time 

• What is responsible for keeping the water on Earth the same over time 

• Answer: The Water Cycle or Hydrological Cycle

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Multiple Choice

The part of the water cycle where water leaves plants

• Evaporation

• Transpiration

• Condensation

• Precipitation

Multiple Choice

The part of the water cycle where water molecules heats up

• Condensation

• Precipitation

• Evaporation

• Transpiration

Multiple Choice

What part of the water cycle is similar to droplets of water formed on a cold glass of water left on a table in a room?

• Precipitation

• Condensation

• Transpiration

• Evaporation

Multiple Choice

The part of the water cycle where water returns to Earth

• Precipitation

• Condensation

• Evaporation

• Transpiration

Parts of water cycle 

• Evaporation : Water changing from liquid to gas

• ​Transpiration: a special type of evaporation where water is evaporated from plants

• Condensation​ : Water changing from gas to liquid

• ​Precipitation : Water return to Earth as rain, sleet, hail or snow

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Multiple Choice

What is responsible for driving the water cycle?

• Wind

• Water

• Sun

• Air

Multiple Choice

The part of the water cycle where water returns to Earth

• Precipitation

• Condensation

• Evaporation

• Transpiration

Multiple Choice

What part of the water cycle is similar to droplets of water formed on a cold glass of water left on a table in a room?

• Precipitation

• Condensation

• Transpiration

• Evaporation

When water returns to Earth it does one of two things 

• Stays on the surface . Water that stays on the surface of the Earth  is called Surface Water 

• Infiltrates and goes underground . This is called Groundwater 

Examples of Surface water 

• Rivers

• Ponds

• Lakes

• Oceans

• Wetlands 

When water goes underground the following features are formed

• Wells 

• Aquifier

• Artesian Well

Multiple Choice

The part of the water cycle where water leaves plants

• Evaporation

• Transpiration

• Condensation

• Precipitation

Multiple Choice

The part of the water cycle where water molecules heats up

• Condensation

• Precipitation

• Evaporation

• Transpiration

Multiple Choice

The part of the water cycle where the water molecules cools

• Precipitation

• Condensation

• Transpiration

• Evaporation

Multiple Choice

The part of the water cycle where water returns to Earth

• Precipitation

• Condensation

• Evaporation

• Transpiration

Open Ended

Where do the water droplets come from that appears on the plastic bag containing a head of lettuce ?

Open Ended

Explain what would happen to an area if there are no trees  

Open Ended

How would the water cycle be affected when more houses and streets are built ?

Open Ended

Why do you believe it rains heavily every afternoon in the Amazon Rainforest?