1.2 + 1.3 Rock changes and is moved

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Instruction 1.2 Rock changes
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Instruction 1.3 Rock is moved

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Slide 1: Tekstslide
AardrijkskundeMiddelbare schoolvwoLeerjaar 2

In deze les zitten 24 slides, met interactieve quiz en tekstslides.

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Today
Instruction 1.2 Rock changes
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Instruction 1.3 Rock is moved

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Slide 1 - Tekstslide

Weathering
The Himalayas and the Andes have much relief.

Mountain tops slowly break down. This is called weathering.

Slide 2 - Tekstslide

Mechanical weathering (1)
  1. cracks and crevices are filled with water after a rain shower
  2. the water expands as it freezes
  3. cracks and crevices slowly get bigger
  4. eventually the rock breaks

Slide 3 - Tekstslide

Mechanical weathering (2)
  1. the rock expands when it is heated by the Sun
  2. the rock contracts when the temperature drops below zero

What will eventually happen to the rock?
The rock will crumble.

Slide 4 - Tekstslide

Mechanical weathering (3)
  1. plant roots grow between cracks
  2. as the roots get wider, the rock may crumble

Slide 5 - Tekstslide

Chemical weathering
Old buildings and statues show traces of chemical weathering.

The speed at which this chemical weathering occurs depends on the climate.

.

Slide 6 - Tekstslide

Chemical weathering
In a warm, humid climate, the chemical weathering process is faster than in a cold, dry climate.

Slide 7 - Tekstslide

Caves
Caves are created by chemical weathering.

There is limestone below the surface of the Earth. Limestone dissolves faster in acidic water than most rocks.

In the Netherlands caves are found in ?
  • Limburg (southern part)

Slide 8 - Tekstslide

Place the processes in the correct order.
1
2
3
4
Precipitation becomes acidic by plant roots
Limestone dissolves
Precipitation falls
Precipitation seeps down through the rock

Slide 9 - Sleepvraag

Question
Which two forms of mechanical weathering occur mainly in a high mountain range?
  • Weathering by the freezing of water and by warming up and cooling down.

Slide 10 - Tekstslide

Question
Which two forms of mechanical weathering occur mainly in a high mountain range?
  • Weathering by the freezing of water and by warming up and cooling down.

Why?
  • During the day the temperature is often above zero and at night below zero. Because the rocks are not covered with soil or plants, they warm up quickly and cool down quickly.

Slide 11 - Tekstslide

Question
Explain how weathering due to heating and cooling also occurs in deserts.
  • In the desert there are big temperature differences between night and day.

Slide 12 - Tekstslide

When loose rock rolls down, slides or falls down a slope, it is called a mass movement.

Slide 13 - Tekstslide

When loose rock rolls down, slides or falls down a slope, it is called a mass movement.

Slide 14 - Tekstslide

Erosion
The abrasive effect of running water, wind or ice is called erosion.

Newly weathered rock is sharp and angular / round and angular in shape.

Slide 15 - Tekstslide

Erosion
Newly weathered rock is sharp and angular in shape.

As the stones in the river collide and rub against each other, they slowly become rounded.
River gravel is thereby found in the upper course of the river.

Slide 16 - Tekstslide

Glaciers
In mountain areas, erosion can also be caused by glaciers.

Snow accumulates because it is cold and does not melt.

Due to the pressure of the snow layers, snow is turned into ice.

Due to the heavy weight of the ice, the glacier ‘flows’ slowly down the mountain.

Slide 17 - Tekstslide

Different valleys
Which of the following valleys is formed by a river and which by a glacier?

Explain your answer.

Slide 18 - Tekstslide

Different valleys
Which of the following valleys is formed by a river and which by a glacier?

Explain your answer.

Slide 19 - Tekstslide

Sand and clay
Hard rock crumbles, wears down and changes its composition.
Weathering and erosion cause rock to break down into small grains.

Put in order from large to small:
clay, river gravel, sand

Slide 20 - Tekstslide

Sand and clay
Hard rock crumbles, wears down and changes its composition.
Weathering and erosion cause rock to break down into small grains.

From large to small:
river gravel, sand, clay

With the naked eye you can see the grains of:
river gravel and sand.
The smallest grains are called: clay.

Slide 21 - Tekstslide

Question
What force on earth plays a major role in moving material
along a slope?
  • Gravity

In which three ways does material move down a slope?
  • By rolling, falling and sliding.

Slide 22 - Tekstslide

Get started
1.2 Rock changes: 2, 3, 8
1.3 Rock is moved 2, 4, 7, 8

Finished early? Improve your map skills: workbook p. 6 and 7 

Slide 23 - Tekstslide

Next week
1.4 Sedimentation

Homework:
1.2 Rock changes: 2, 3, 8
1.3 Rock is moved: 2, 4, 7, 8

Slide 24 - Tekstslide