§3.4: water: too much or too little - part 2

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• Leerjaar 2

§3.4: water: too much or too little

Today

• Recap previous lesson
• Explanation §3.4
• Assignments workbook

Water

Explain in 5 steps how clouds are formed

The formation of clouds

The sun heats the ocean, the water from the ocean .. 1 .. . The air with .. 2 .. rises. As the air rises, it .. 3 .. . High up in the air, water vapour .. 4 .. to form clouds. If the drops of water become too heavy, it starts raining or snowing: this is .. 5 ... 

precipitation

condenses

evaporates

cools down

water vapor

1

2

3

4

5

Where do you see:

• Short water cycle
  
• Long water cycle
  

Explain the difference 

between:

• Evaporation
  
• Condensation
  
• Precipitation
  
• Infiltration

Today

• Recap previous lesson
• Explanation §3.4
• Assignments workbook

Learning goals

• You understand how relief rainfall, convectional rainfall and frontal rainfall are being formed
  
• You can point out the regions with high and low precipitation on a map 

Vocabulary 

Precipitation	Neerslag
Convectional rainfall	Stijgingsregen
Relief rainfall	Stuwingsregen
Frontal rain	Frontale regen
Humid	Vochtig
Windward side	Loefzijde
Leeward side	Lijzijde
Descending air	Dalende lucht

Precipitation

• Convectional rainfall: rain that  forms when it is very hot and a lot of water evaporates and rises
• Relief rainfall: rain that forms when air is blown against a mountain and is forced to rise 
  
• Frontal rainfall: rain formed because warm and cold air meet.

Precipitation always needs rising air!

1: Convectional rainfall (stijgingsregen)

1. Hot air rises 
2. The higher the colder
3. The water vapor in the rising air condenses 
4. Clouds are formed
5. Water droplets accumulate > precipitation 

2: Relief rainfall (sturingsregen)

1. Air is blow against a mountain
2. The air is forced to rise
3. The air cools down and condenses > precipitation

Other side of the mountain: dry, descending air 

3: Frontal rain 

(frontale regen)

1.  Warm air from low latitudes collides with cold air from polar regions
2. The warm air is forced to rise > precipitation 

0

Match the concepts and the definitions by dragging the concept to the right definition

Rain that forms when it is very hot and a lot of water evaporates and rises.

The process in which sea water evaporates and falls back into the sea through clouds and precipitation.

The process in which seawater evaporates and flows back to the sea through clouds, precipitation, groundwater and rivers.

Rain that forms when air is blown against a mountain and is forced to rise.

Rain that forms when two air masses meet and one air mass rises over the other

Relief rainfall

Convectional rainfall

Long water cycle

Short water cycle

Frontal rainfall

An unequal distribution

Precipitation per year:

• Tropics: 2000 mm
• Desert: 250 mm 

Learning goals

• You understand how relief rainfall, convectional rainfall and frontal rainfall are being formed
  
• You can point out the regions with high and low precipitation on a map 

Today

• Recap previous lesson
• Explanation §3.4
• Assignments workbook

Start homework

• Read §3.4
• Make assignment 4, 5, 6 and 7

Finished?

Have the assignments checked by the teacher