Mon Prof Augmenté
Rain on a Split Hillside
Rain hits both halves of the same slope with the same force. On the bare side the water carves channels and carries soil downhill, while the grass and its roots hold the soil together on the other side.
This picture is part of the full library
Every lesson is open to everyone for 7 days after it is published. This one came out on September 8, 2026: its text stays readable here, and its picture opens with a subscription.
The app is free. A subscription opens every lesson, in every school year.
Age 15: open this week
Browse Age 15
In the picture
- Bare packed earth on the left half of the slope
- One of three gullies cut into the bare earth
- Brown mud fan spread at the foot of the bare half
- Dense grass covering the right half of the slope
- Root network in the cut soil edge under the grass
Examples
- A garden bed left bare all winter loses soil in every downpour, while the lawn beside it stays level.
- Road embankments are seeded with grass so heavy rain does not wash them onto the road surface.
Key takeaways
- Falling rain and running water move loose soil downhill.
- Plant roots bind soil grains together and slow water at the surface.
Carry on in the app
Three questions on this lesson. It has left the free week, so its quiz is for subscribers.
At least one new illustrated lesson every weekday for your child’s year, with its quiz and a reminder at 6:15 pm.
Get the app
Free app, optional subscription
App Store Google Play
