8. Soil

Question 1

What is soil erosion?

Answer 1

Soil erosion is a natural process as soil particles are removed by wind or water or movement of animals.

Question 2

In soils that _______ been affected by human activities, the rate of erosion is likely to be ______________ than the rate of soil formation. Erosion becomes a problem when it occurs ___________ than soil formation.

Answer 2

In soils that HAVE NOT been affected by human activities, the rate of erosion is likely to be THE SAME OR LESS than the rate of soil formation. Erosion becomes a problem when it occurs MORE RAPIDLY than soil formation.

Question 3

What are the two main types of soil erosion?

Answer 3

1. Wind erosion

2. Water erosion

Question 4

Why / how does wind erosion happen?

Answer 4

When some soils are dry, especially those with a low clay content, they are likely to be loose with little cohesion between the particles which would hold the soil together. If it is windy and the soil is unprotected it bay blow away.

Question 5

what is soil?

Answer 5

soil is vital for the effective growth of plants, which are the ‘starters’ of food chains and ecosystems.

Question 6

what is a fertile soil?

Answer 6

a fertile soil is a soil that has the nutrients to sustain plant growth and has a number of vital components?

Question 7

what are the vital components of fertile soil?

Answer 7

…

Question 8

what human activities affect soil fertility? (.)

Answer 8

• ploughing affects aeration
• irrigation
• soil compaction and increasing bulk density