3.-Geomorphic-Processes.pptx

Earth Science

1. Focus Task What do the images show processes of? Tuesday, 10 September 2019 How do geomorphic processes shape the land?

2. Starter Practice exam question.

3. Geomorphic Processes What does the term ‘geomorphic processes’ mean? A geomorphic process is something that changes the shape of the land. Examples include: erosion, weathering, mass movement, deposition and transportation.

4. Geomorphic Processes Match up the key words to their correct meaning. Key Word Meaning Mass movement The break up of rocks by weather. Weathering The wearing away and removing of material by a moving force. Erosion Sudden movement of material down a slope caused by gravity. Deposition The movement of eroded material by the river or sea. Transportation The laying down of material that has been moved.

5. Geomorphic Processes Match up the key words to their correct meaning. Key Word Meaning Mass movement The break up of rocks by weather. Weathering The wearing away and removing of material by a moving force. Erosion Sudden movement of material down a slope caused by gravity. Deposition The movement of eroded material by the river or sea. Transportation The laying down of material that has been moved.

6. Mass Movement Mass movement is the movement of material (rock) down a slope due to gravity.   There are two different types: sliding and slumping. Type of mass movement How it works Sliding Rock or loss material slide downhill, often due to heavy rain. Slumping Collapse of weak rock, such as sand and clay. Again this is due to heavy rainfall.

7. Weathering There are three types of weathering: biological, chemical and mechanical. Create a table like the one shown, and describe how each type of weathering works.   Type of weathering How it works Biological Chemical Mechanical

8. Weathering There are three types of weathering: biological, chemical and mechanical. Create a table like the one shown, and describe how each type of weathering works.   Type of weathering How it works Biological The actions of plants (roots) and animals (burrowing) crack rocks. Chemical Acid water (CO2) breaks down/dissolves rocks in a chemical reaction. Mechanical The breakdown of rocks without using chemicals. Wind, frost and snow can help.

9. Erosion Erosion is the wearing away and removal of material (rock and sand) by a moving force (water). How do you think each type of erosion works?   Type of erosion How it works H ydraulic Action A brasion A ttrition S olution

10. Erosion Erosion is the wearing away and removal of material (rock and sand) by a moving force (water).   Type of erosion How it works H ydraulic Action Pressure of water hitting a surface, forcing air into cracks which breaks away rocks. A brasion Rocks scrape and smooth the sea/river bed and cliffs/banks. A ttrition A reduction in the size of rocks. S olution Rock is dissolved in a chemical reaction by water.

11. Deposition Deposition is when material being transported (moved) is dropped due to a loss of energy. This can lead to the creation of beaches, like the one shown at Roker in Sunderland.  

12. Transportation Transportation is when material is transported (moved) from one place to another. There are four different types of transportation. How do you think the four types of transportation work?  

13. Transportation Type of erosion How it works T raction Large particles (boulders/rocks) roll along the seabed. S altation A bouncing motion of pebbles along the seabed. S uspension Particles suspended (float) in the water. S olution Chemicals dissolved in water and are moved.

14. Steps to Success Examine the impact of geomorphic processes on river landscapes.   Step What to include 1: Opening sentence Geomorphic processes such as ……… impact river landscapes. 2: Erosion Explain how at least two types of erosion work and what landforms they can create. 3: Mass Movement Explain how mass movement (sliding and slumping) work. 4: Transportation Explain how at least two types of transportation work, and the impact this has. 5. Judgement- do geomorphic processes impact river landscapes? Geomorphic processes do/do not impact river landscapes. This is because…

15. Resources

16. Key Word Meaning Mass movement The break up of rocks by weather. Weathering The wearing away and removing of material by a moving force. Erosion Sudden movement of material down a slope caused by gravity. Deposition The movement of eroded material by the river or sea. Transportation The laying down of material that has been moved. Key Word Meaning Mass movement The break up of rocks by weather. Weathering The wearing away and removing of material by a moving force. Erosion Sudden movement of material down a slope caused by gravity. Deposition The movement of eroded material by the river or sea. Transportation The laying down of material that has been moved. Key Word Meaning Mass movement The break up of rocks by weather. Weathering The wearing away and removing of material by a moving force. Erosion Sudden movement of material down a slope caused by gravity. Deposition The movement of eroded material by the river or sea. Transportation The laying down of material that has been moved. Key Word Meaning Mass movement The break up of rocks by weather. Weathering The wearing away and removing of material by a moving force. Erosion Sudden movement of material down a slope caused by gravity. Deposition The movement of eroded material by the river or sea. Transportation The laying down of material that has been moved.

17. Abrasion: Small rocks carried by the river are hurled at the cliffs causing them to be worn away. Sliding Heavy rain soaks into permeable rocks, lubricating them causing material to suddenly move down a slope due to the pull of gravity. Deposition : When a river slows down it has less energy and velocity, this causes sediment to be deposited. Mechanical- Wind: High winds remove finer sediment which can then be blown into the river causing more abrasion. Chemical: Acid rain reacts with minerals which breaks them down and makes it easy for them to be washed away. Minerals are also weakened when they are exposed to the air in a process called oxidation. Attrition : Small rocks carried by the river are hurled at the cliffs causing them to be worn away. Saltation: Stones and small pebbles are bounced along the river bed, due to the flow of the river. Traction : Large rocks and boulders are rolled along the river bed. Suspension: Very light material is carried along the river, this sediment is very fine and can make the river look dirty. Solution: Rocks such as limestone are broken down into soluble materials by the chemicals in the river water. Solution : Some sediments are dissolved and carried along by the river. Mechanical - Frost: Waters gets into cracks and freezes, causes it to expand, this puts pressure on the rocks and causes the rocks to break up. Biological- Plants and Animals : Burrowing animals such as rabbits and voles and tree roots loosen and break up rocks which allows the river water to penetrate them . Hydraulic action: The power of moving water which is forced against cliffs causing them to be worn away. Slumping Clay becomes waterlogged and slumps down into the river suddenly due to the pull of gravity. Key Weathering Erosion Mass Movement Transportation Deposition