Preventing Erosion

Question 1

Liam has a small sand garden on a gentle slope behind his house. After every rain, the sand slides down the hill. Which two design ideas together would work best to keep the sand from moving?

Accepted Answer

Plant a thick cover of grass seeds and build a low wooden retaining wall behind the sand garden.

Answer

Place a layer of smooth river stones on the slope and put a wooden fence at the top of the hill.

Answer

Spread a thick sheet of clear plastic over the sand and scatter a few large rocks on it.

Answer

Install a metal drain pipe that sends the rainwater straight down the slope.

Question 2

After a big rain, water rushes down the sloped side of Maya's backyard where she keeps a flower bed. She wants to keep the soil from washing away. Which pair of erosion‑control ideas would work best together?

Accepted Answer

Place a short line of smooth stones at the bottom of the slope and plant low‑lying grass along the hill.

Answer

Plant only a few tall sunflowers in the middle of the bed.

Answer

Build a tall wooden fence right at the top of the slope.

Answer

Cover the entire slope with a sheet of clear plastic.

Question 3

A hill has loose soil that can be washed away by rain. Which of the following would be the best solution to slow the water and keep the soil from changing the shape of the hill?

Accepted Answer

Planting grass or other vegetation on the hill

Answer

Building a tall wooden fence around the hill

Answer

Painting the hill a bright color

Answer

Leaving the hill empty with no changes

Try three questions

Liam has a small sand garden on a gentle slope behind his house. After every rain, the sand slides down the hill. Which two design ideas together would work best to keep the sand from moving?

After a big rain, water rushes down the sloped side of Maya's backyard where she keeps a flower bed. She wants to keep the soil from washing away. Which pair of erosion‑control ideas would work best together?

A hill has loose soil that can be washed away by rain. Which of the following would be the best solution to slow the water and keep the soil from changing the shape of the hill?

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