How does afforestation help to control flood and landslide.​

Afforestation. Trees are planted near to the river. This means greater interception of rainwater and lower river discharge . This is a relatively low cost option, which enhances the environmental quality of the drainage basin .

Trees prevent floods, landslides

They help the groundwater supply recharge, prevent the transport of chemicals into streams and prevent flooding. ... The trees' roots suck water deep from under the ground to as low as 200 feet. They hold the soil together so that erosion is prevented.

Explanation:

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your answer is c! hope this : )

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me