What is happening to the rock in all three cases?

Erosion = ROCKS WEAR AWAY

Weathering = ROCKS BREAK UP

Date

The difference between weathering and erosion

Now the difficult bit….Rivers erode in 5 main ways:

Write this down under your previous note about weathering and erosion – LEAVE 2 LINES

BETWEEN EACH NUMBER

Can you think of what some of them might be?

1. The river ‘bashes’ sand and stones against the banks

2. As river water is acidic, it can dissolve the banks away

3. The water itself forces cracks apart

4. As they get washed along by the river, stones knock into each other

5. The river scrapes stones along its bed

Can you match the words to the meanings?

attritionhydraulic action corrasion

corrosion abrasionNow add the terms to your notes

1. The river ‘bashes’ sand and stones against the banks

2. As river water is acidic, it can dissolve the banks away

3. The water itself forces cracks apart

4. As they get washed along by the river, stones knock into each other

5. The river scrapes stones along its bed

Now…

…how to remember the words and meanings

CorrasionCor! Aaah!

Fire hydrant

Corrosion

Chemical erosion

Rock most susceptible? Why?

Hydraulic action

(1)Spelling – hydraulic not hydrolic

(2)What does ‘hydr’ refer to?

(3)Air in cracks compressed

Attrition

Onomatopoeic?

Rock demo – angular or smooth

AbrasionA medical term….