1.4 Rock becomes sediment

• Aardrijkskunde
• Middelbare school
• vmbo t, mavo, havo, vwo
• Leerjaar 2

1.4 Rock becomes sediment

Part 1

Learning goals

- You can recognise the upper, midle and lower courses of rivers from photos.

- You understand how sedimentary rock is formed.

- You can explain how sandbanks, dunes and deltas are formed

Upper course

Middle course

Lower course

The Upper course

Upper course

Upper course

Upper course

Upper course: 
- weathering material (sediments) ends up in glaciers and rivers.

= sediments that have been loosened by weathering.

(rock that is formed by the deposit of material by water, wind or ice.)

- height difference large

- stream speed high

- deep valleys scoured

- a lot of erosion

The Middle course

Middle course

Middle course

Middle course

Middle course:

- height differences smaller

- river flows less quickly

- power of water decreases

- less erosion

- sedimentation of medium-sized pieces

The Lower course

Lower course

Lower course

Lower course

Lower course:

- little to no relief

- flat area

- river flows slowly

- sedimentation of small particles

Make exercise
2 and 3

1.4 Rock becomes sediment

Part 2

Learning goals

- You can recognise the upper, middle and lower courses of rivers from photos.

- You understand how sedimentary rock is formed.

- You can explain how sandbanks, dunes and deltas are formed

What are the characteristics of upper, middle and lower course.

The origins of a grain of sand

The heaviest material sinks first and the lightest material is deposited furthest from the river.

Delta

How do you recognize a delta?

-A piece of land that extends into the sea.

-The river branches into several channels.

-It has a shape of a triangle.

Rivers flow into the sea in different ways:

Delta: coast that is being formed when more material is deposited at the mouth of a river than is discharged into the sea by the current.

Estuary: wide river estuary, often in the shape of a funnel (trechter), which has been scoured by ebb and flow currents 

The formation of dunes

Sandbank: a deposit of sand forming a shallow area in the sea or a river. Beaches form on these.

Dunes: a mound of sand formed by the wind, usually along the beach. 

Some of the sand that ends up in the sea ultimately forms the dunes.

Go to page 40-43

Make ex: 1, 4 and 5