Les 1 - §3.1 Water in Motion

• Aardrijkskunde
• Middelbare school
• vwo
• Leerjaar 3

I fall, but I never hurt. I run, but I have no feet. I have a mouth but I cannot eat. What am I?

Planning

Start on chapter 3

• How important is water?
• Is there enough water?

Key words §3.1

Fresh water (zoet water): Water with a low concentration of dissolved salt. Drinking water is fresh water too.

Salt water (zout water): Water with a high concentration of dissolved salt. Sea water for example

Precipitation (neerslag): The different ways water falls back down to earth. For instance as rain, snow or hail.

Evaporation (verdamping): The process of water in liquid form turning into water in gaseous (gas) form. So the sea turning into clouds basically.

Hydrological cycle (waterkringloop): The process by which seawater returns to the sea through evaporation and precipitation, and through groundwater and rivers

Surface water (oppervlaktewater): water that is visible, such as lakes, rivers and seas

Ground water (grondwater): Water that is no longer visible, because it has infiltrated into the rock, and is now underground.

Glacier (gletsjer): Large bodies of ice on mountains as a result of snow falling on the mountains, which accumulates over time

Landice (landijs): Masses of ice which are on land

Learning objectives §3.1

• You know the amount of water that is suitable and reachable for human consumption
• You that water is not equally distributed across the world, seasonally, and locally

How long can you go without water (on average)?

1. 1 day
2. 3 days
3. 5 days
4. 14 days

Water

It is kinda important for us

But how much is there and do we have enough?

Which percentage of all water on earth is fresh water?

1. 22,3%
2. 57,8%
3. 2,5%
4. 7,5%

Fresh water vs. Salt water

• 97,5% salt water
• 2,5% fresh water

Which percentage (potentially) use of this fresh water?

1. 50%
2. 70%
3. 20%
4. 1%

Accessible water

• 69% ice
• 30% deep groundwater
• 1% easily accesible

What holds more fresh water?

1. Rivers
2. Plants
3. The air
4. Animals

Accessible water

• 52% in lakes
• 38% groundwater
• 8% in the air
• 1% in rivers
• 1% in plants

Accessible water

• In conclusion only 0,25% of all water is accessible to us
• And that is also water we use to flush our toilets...

Is there enough water?

1. yes
2. no

Is there enough water?

kinda...

If it were equally divided across the world

Waterstress

Water is not equally divided in multiple ways

• Worldwide
• Seasonally
• Locally

Waterstress happens when more water is used than available in an area

Next time

The hydrological cycle