The Journey of River Gravel, Sand and Clay

• Aardrijkskunde
• Middelbare school
• vwo
• Leerjaar 2

The Journey of River Gravel, Sand and Clay

1.4 What happens to all the river gravel, sand, and clay?

By: Jinse van Maaren

lesson goal

At the end of the lesson, you will be able to understand the journey of river gravel, sand, and clay.

Explain to the students that they will be learning about the movement of river gravel, sand and clay from their source to where they end up.

How is sedimentary rock formed at the bottom of the sea?

What do you see?

Transportation

River gravel, sand and clay are transported downstream by the river's current.

Discuss how the river's current helps to transport the river gravel, sand and clay downstream.

Sorting

River gravel, sand and clay are sorted by size as they move downstream.

Discuss why river gravel, sand and clay are sorted by size and how it affects their movement.

What weathered material gets deposited first in a river?

1. Sand
2. Clay
3. River gravel
4. None, any one of these can be deposited first

How does weathered material get sorted in a river?

When the river's current slows down, river gravel, sand, and clay are deposited on the riverbed.

Explain what deposition is and how it affects the movement of river gravel, sand and clay.

Delta's and sandbanks

When the current slows down after the river has ended into the sea, Sandbanks can form.

New land can also be created when a river flows into the sea, this is called a Delta

Explain what a delta is and how it is formed by river gravel, sand and clay.

What do you think flood plains are?

Sedimentary rock

• Different
• Formed by pressure and heat
• usually clearly layerd 

What are the names for the rock formed by clay and sand?

How is an oxbow lake formed?

homework

Workbook questions 1.4