2.4 Sedimentation

• Aardrijkskunde
• Middelbare school
• vwo
• Leerjaar 2

Program

Homework: WB page 42-43: 3,6,7

Sedimentation

- in the riverplain

- near the rivermouth

Homework

Q3b: Under which circumstances will a glacier become larger?

1. Cold winters, warm summers
2. Mild winters, cool summers

From mountain to the sea

A river basin can be divided into three parts:

- upper course

- middle course

- lower course

In which part of the river basin does most of the mechanical weathering take place?

1. Upper reaches
2. Middle reaches
3. Lower reaches

In which part of the river basin does most of the erosion take place? Explain your choice.

Shingle, sand and clay

Mechanical weathering and erosion of rock  result in shingle (=gravel), sand and clay.

Sand

Shingle

Rock

Clay

Transport  

Shingle, sand and clay are transported in the river basin to the lower reaches of the river.

What does the river transport in the upper reaches?

1. Shingle
2. Sand
3. Shingle and sand
4. Shingle, sand and clay

The middle reaches: sedimentation

The river is slowing down 

==> sedimentation at the bottom of the river and in the inner bends

In the middle reaches sedimentation by the river starts. Which type of soil will be deposited first?

1. Shingle
2. Sand
3. Clay

The lower reaches: sedimentation

During high water levels in the river, the river plain floods.  

==> the water comes to a standstil: sand and especially clay are deposited.

Sand and clay are deposited at various locations in the river plain. What do we find near the river itself?

1. Sand
2. Clay

The river mouth

In the river mouth, the water also comes to a standstill. 

==> sand and clay is deposited and a delta is formed

The river mouth

How can you recognize a delta?

1. A piece of land that stretches out into sea.

2. The river splits into several branches.

3. It has the shape of a triangle.

Get started!

Textbook: read page 34-35: The river Po

Workbook page 44

Assignments:  1,2,4 and 5 

(watch the Youtube-movie in Magister before starting assignment 5)

Thursday 21th of January: Formative Test 2.1-2.3