Science Starter True or False <ul><li>Write each statement in your science notebook.  If it is true leave it alone, if it ...
Mechanical & Chemical Forces break down Rocks
The BIG Idea <ul><li>NATURAL FORCES BREAK ROCKS APART AND FORM SOIL, WHICH SUPPORTS LIFE.  </li></ul>
Think <ul><li>Imagine the tiniest rock you have ever found.  How did it get so small?  It didn’t start out that way! What ...
Mechanical Weathering  <ul><li>The natural process of mechanical weathering, physical forces split rocks apart but do not ...
Ice Wedging <ul><li>Water freezes in the cracks of rocks and expands.  The force of expansion is strong enough to split th...
Pressure Release <ul><li>Earth’s forces can push rock that formed deep underground up to the surface.  </li></ul>
Exfoliation <ul><li>The process in which layers or sheets of rock gradually break off.   </li></ul>
Plant Root Growth <ul><li>Trees, bushes and other plants may take root in cracks in rocks.  As the roots grow, they wedge ...
Tree Root Growth Ruins of Ta Prohm, one of the temples of Ankor Wat
Abrasion <ul><li>Water wears down rocks on riverbeds and along shorelines by abrasion.  The force of moving water alone ca...
Chemical Weathering <ul><li>Minerals in rocks undergo chemical changes when they react with water and air.  </li></ul>
Dissolving  <ul><li>Water is the main cause of chemical weathering.  Some minerals can completely disolve in water. </li><...
Rusting <ul><li>Oxygen, water, and dissolved minerals containing iron produce rust.  </li></ul>
Weathering occurs at different rates   <ul><li>Most weathering occurs over long periods of time- hundreds, thousands, or e...
Things that affect the rate of weathering <ul><li>Surface Area-  the more of a rock that is exposed, the faster it will sh...
QUESTIONS <ul><li>? </li></ul>
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4.1

  1. 1. Science Starter True or False <ul><li>Write each statement in your science notebook. If it is true leave it alone, if it is false change it to make it true. </li></ul><ul><li>The set of natural processes that form, change, and re-form rock is called the rock cycle </li></ul><ul><li>Rocks and minerals are the same thing. </li></ul><ul><li>Igneous rock develops from layers of sediment. </li></ul>
  2. 2. Mechanical & Chemical Forces break down Rocks
  3. 3. The BIG Idea <ul><li>NATURAL FORCES BREAK ROCKS APART AND FORM SOIL, WHICH SUPPORTS LIFE. </li></ul>
  4. 4. Think <ul><li>Imagine the tiniest rock you have ever found. How did it get so small? It didn’t start out that way! What forces created this rock? </li></ul>
  5. 5. Mechanical Weathering <ul><li>The natural process of mechanical weathering, physical forces split rocks apart but do not change their composition (like smashing a walnut). </li></ul>
  6. 6. Ice Wedging <ul><li>Water freezes in the cracks of rocks and expands. The force of expansion is strong enough to split the rocks apart. This process can break up huge boulders. </li></ul>
  7. 7. Pressure Release <ul><li>Earth’s forces can push rock that formed deep underground up to the surface. </li></ul>
  8. 8. Exfoliation <ul><li>The process in which layers or sheets of rock gradually break off. </li></ul>
  9. 9. Plant Root Growth <ul><li>Trees, bushes and other plants may take root in cracks in rocks. As the roots grow, they wedge the rocks open. </li></ul>
  10. 10. Tree Root Growth Ruins of Ta Prohm, one of the temples of Ankor Wat
  11. 11. Abrasion <ul><li>Water wears down rocks on riverbeds and along shorelines by abrasion. The force of moving water alone causes this.. </li></ul>
  12. 12. Chemical Weathering <ul><li>Minerals in rocks undergo chemical changes when they react with water and air. </li></ul>
  13. 13. Dissolving <ul><li>Water is the main cause of chemical weathering. Some minerals can completely disolve in water. </li></ul>
  14. 14. Rusting <ul><li>Oxygen, water, and dissolved minerals containing iron produce rust. </li></ul>
  15. 15. Weathering occurs at different rates <ul><li>Most weathering occurs over long periods of time- hundreds, thousands, or even millions of years. </li></ul>
  16. 16. Things that affect the rate of weathering <ul><li>Surface Area- the more of a rock that is exposed, the faster it will show affects of weathering </li></ul><ul><li>Rock Composition- the harder the rock, the slower it shows signs of weathering </li></ul><ul><li>Climate- hot, wet regions weather rocks faster than cold, dry ones </li></ul>
  17. 17. QUESTIONS <ul><li>? </li></ul>

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