7th Grade Chapter 1 Lesson 5


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7th Grade Chapter 1 Lesson 5

  1. 1. 7 th Grade Chapter 1 Lesson 5 Pgs. 26-29 For Student Use Only
  2. 2. Air and Water and Soil <ul><li>Plants also need air and water to survive. </li></ul><ul><ul><li>Air comes from the pore spaces in the soil. </li></ul></ul><ul><ul><ul><li>Pore spaces- created when water evaporates from the soil and air replaces the area where the water was </li></ul></ul></ul><ul><ul><ul><li>Sand has good drainage and air pockets, clay and silt do not provide good drainage and do not have good air pockets </li></ul></ul></ul>
  3. 3. Air and Water and Soil <ul><li>Ground Water </li></ul><ul><ul><li>Even though it rains, plants still need water </li></ul></ul><ul><ul><ul><li>Most water runs off the ground when it rains because soil can only hold a certain amount of water in each pore space. </li></ul></ul></ul><ul><ul><ul><li>Plant use some of the absorbed water, the rest of the water goes down through the soil. </li></ul></ul></ul><ul><ul><li>Absorbed water will eventually hit an impremeable layer (non-porous layer) of bedrock. </li></ul></ul>
  4. 4. Air and Water and Soil <ul><li>Ground Water </li></ul><ul><ul><li>When the water can go no further into the earth, it spreads out along the impermeable rock layer until it finds an area that is porous </li></ul></ul><ul><ul><li>The water fills the pores above the impermeable rock layer and the soil and rocks become saturated (full) </li></ul></ul><ul><ul><ul><li>Water Table: Upper surface of saturated ground </li></ul></ul></ul><ul><ul><ul><li>Ground Water: Anything below the water table </li></ul></ul></ul>
  5. 5. Air and Water and Soil <ul><li>Ground Water </li></ul><ul><ul><li>The ground water is what people with wells drink. Well depth depends on the size of pores and recent rainfall </li></ul></ul>
  6. 6. Air and Water and Soil <ul><li>Ground Water </li></ul><ul><ul><li>Aquifers: </li></ul></ul><ul><ul><ul><li>Layers of porous rock or of a gravel-soil mixture that are capable of holding water </li></ul></ul></ul><ul><ul><ul><li>Aquifers can be above or below impermeable rock layers </li></ul></ul></ul><ul><ul><ul><li>Some are recharged by rainfall, and some are not </li></ul></ul></ul>
  7. 7. Air and Water and Soil <ul><li>Ground Water </li></ul><ul><ul><li>Artesian Wells: </li></ul></ul><ul><ul><ul><li>Water that is trapped below impermeable rock layers have high pressure from the continued flow of water into the aquifer. </li></ul></ul></ul><ul><ul><ul><li>When a well is dug into this high pressure water, the pressure forces the water to rise up into the well. </li></ul></ul></ul>
  8. 8. Air and Water and Soil <ul><li>Ground Water </li></ul><ul><ul><li>Capillary Action </li></ul></ul><ul><ul><ul><li>Water can flow up the well, into soil, or from root to stem because of the attraction of water molecules </li></ul></ul></ul><ul><ul><ul><ul><li>Water molecules are attracted to each other. This attraction is slightly stronger than gravity. This is called capillary action. </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Capillary Action : the upward movement of water through a tiny space in response to tension. </li></ul></ul></ul></ul>
  9. 9. Air and Water and Soil <ul><li>Ground Water </li></ul><ul><ul><li>Water coats soil particles and dissolves nutrients </li></ul></ul><ul><ul><ul><li>Some water goes into plants and plants use nutrients </li></ul></ul></ul><ul><ul><ul><li>Some water stays attached to the soil particles </li></ul></ul></ul><ul><ul><ul><li>Only about half the water in soil is available for plants. </li></ul></ul></ul>