Ways to slow wind and water from wearing away land

Question 1

The bare tray lost 441 g of soil and the grassy tray lost 83 g. What is the best explanation?

• A. Plant roots hold soil in place.
• B. The grassy tray was watered less.
• C. Water does not move soil.
• D. Grass makes soil heavier than rocks.

Question 2

Engineers test two designs to stop a hill washing away. How should they decide which is better?

• A. Ask which one is cheapest and never test.
• B. Test only one of them.
• C. Test both in the same way and measure how much soil is lost.
• D. Pick the one with the nicest colour.

Question 3

Does this slow erosion or make it worse: walking new paths through dunes?

• A. slows erosion
• B. makes erosion worse

Question 4

The bare tray lost 583 g of soil and the grassy tray lost 140 g. What is the best explanation?

• A. Water does not move soil.
• B. The grassy tray was watered less.
• C. Plant roots hold soil in place.
• D. Grass makes soil heavier than rocks.

Question 5

Waves are washing away a beach near some houses. Which plan would help most?

• A. remove the plants on the dunes
• B. dig the sand away faster
• C. paint the houses
• D. build a sea wall or rock barrier

Question 6

Does this slow erosion or make it worse: a sea wall?

• A. slows erosion
• B. makes erosion worse

Question 7

The bare tray lost 300 g of soil and the grassy tray lost 99 g. What is the best explanation?

• A. Plant roots hold soil in place.
• B. Grass makes soil heavier than rocks.
• C. The grassy tray was watered less.
• D. Water does not move soil.

Question 8

Signs on sand dunes ask people to stay on the paths. Why?

• A. The dunes belong to the birds only.
• B. Feet crush dune plants whose roots hold the sand.
• C. The sand is too hot.
• D. Paths are prettier.

Question 9

Does this slow erosion or make it worse: walking new paths through dunes?

• A. slows erosion
• B. makes erosion worse

Question 10

Two sloping trays of soil were watered with the same watering can. One tray had grass growing in it. How many more grams of soil washed off the bare tray?

Answer g

Question 11

Engineers test two designs to stop a hill washing away. How should they decide which is better?

• A. Pick the one with the nicest colour.
• B. Ask which one is cheapest and never test.
• C. Test only one of them.
• D. Test both in the same way and measure how much soil is lost.

Question 12

Does this slow erosion or make it worse: sand fences on a dune?

• A. slows erosion
• B. makes erosion worse

Question 13

The bare tray lost 498 g of soil and the grassy tray lost 92 g. What is the best explanation?

• A. Plant roots hold soil in place.
• B. Water does not move soil.
• C. The grassy tray was watered less.
• D. Grass makes soil heavier than rocks.

Question 14

Waves are washing away a beach near some houses. Which plan would help most?

• A. build a sea wall or rock barrier
• B. paint the houses
• C. remove the plants on the dunes
• D. dig the sand away faster

Question 15

Does this slow erosion or make it worse: leaving fields bare in winter?

• A. slows erosion
• B. makes erosion worse

Question 16

Two sloping trays of soil were watered with the same watering can. One tray had grass growing in it. How many more grams of soil washed off the bare tray?

Answer g