4.3

344 views

Published on

Published in: Technology
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
344
On SlideShare
0
From Embeds
0
Number of Embeds
3
Actions
Shares
0
Downloads
2
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

4.3

  1. 1. Science Starter Write the questions in your notebook. Answer for homework <ul><li>What is the main component of soil? </li></ul><ul><li>How do microorganisms affect soil? </li></ul><ul><li>How do humans have a negative effect on soil? </li></ul><ul><li>How do humans conserve soil? </li></ul>
  2. 2. Human Activities Affect Soil
  3. 3. Why do we care about soil? <ul><li>Soil supports all life on Earth- including your life. </li></ul>
  4. 4. Farming Can be harmful to soil <ul><li>Fertilizers help plants grow- sometimes harm the microorganisms in the soil </li></ul><ul><li>Fertilizers also add to pollution </li></ul><ul><li>Farming can cause soil loss </li></ul><ul><li>Overgrazing (farm animals eating too much vegetation) can lead to desertification </li></ul>
  5. 5. Desertification <ul><li>The expansion of desert conditions in areas where the natural plant cover has been destroyed </li></ul>
  6. 6. Construction & Development <ul><li>In order to make roads, houses, shopping malls, and other buildings people need to dig up soil. </li></ul><ul><li>The removed soil can build up on river beds and lakes </li></ul><ul><ul><li>This can harm the microorganism that live in the area </li></ul></ul><ul><ul><li>This can also cause floods because the water level rises </li></ul></ul><ul><ul><li>Soil can fill up bodies of water </li></ul></ul>
  7. 7. Mining <ul><li>Strip mining and open pit mining cause loss of soil </li></ul><ul><li>The removal of plants and soil can speed the weathering process </li></ul><ul><li>Abandoned mines can fill with rain water and cause pollution </li></ul>
  8. 8. Soil Conservation <ul><li>People are finding ways to conserve soil since it takes so long (hundreds to thousands of years) to form. </li></ul>
  9. 9. Crop Rotation <ul><li>The practice of planting different crops on the same field in different years or growing seasons. </li></ul>
  10. 10. Conservation Tillage <ul><li>Includes several methods of reducing the number of times a field are tilled, or plowed in a year. </li></ul>
  11. 11. Terraces <ul><li>Flat, step-like areas built on a hillside to rainwater and prevent it from running downhill. </li></ul>
  12. 12. Contour Plowing <ul><li>The practice of plowing along the curves, or contours, of a slope </li></ul>
  13. 13. Windbreaks <ul><li>Rows of trees planted between fields to “break” or reduce the force of winds that can carry off soil </li></ul>

×