Weathering by David Edwards
There are two main types of weathering which are called: Chemical Weathering & Freeze-Thaw Weathering
Chemical Weathering
Chemical weathering is when rain water (carbonic acid) reacts with limestone and dissolves  or removes  the limestone slow...
The rain water flows down the joints and into the bedding planes, and over time the joints widen to create grykes.
This happens because the rock is PERVIOUS
Pervious rock allows water to flow through the joints and bedding planes, but not sink through the rock itself.
The equation for chemical weathering is: Limes tone + Carbonic Acid (rain water) = Calcium Bicarbonate (soluble lim estone...
Freeze-thaw Weathering
Water collects in the cracks and joints in the rock . This is how freeze-thaw weathering works:
The temperature cools and the water freezes, expanding by 9% in the cracks., and the increased pressure leads to cracks wi...
Repeated freeze-thaw action increases the size of the crack until a block of the rock breaks off. These loose bits of rock...
Freeze-thaw weathering can lead to the forming of tors such as "Bowermans' Nose".
Key Words <ul><li>Bedding Planes  –  Horizontal gaps in rock </li></ul><ul><li>Joints  –  Vertical gaps in rock   </li></u...
Upcoming SlideShare
Loading in …5
×

weathering

1,398 views

Published on

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

No Downloads
Views
Total views
1,398
On SlideShare
0
From Embeds
0
Number of Embeds
46
Actions
Shares
0
Downloads
0
Comments
0
Likes
2
Embeds 0
No embeds

No notes for slide

weathering

  1. 1. Weathering by David Edwards
  2. 2. There are two main types of weathering which are called: Chemical Weathering & Freeze-Thaw Weathering
  3. 3. Chemical Weathering
  4. 4. Chemical weathering is when rain water (carbonic acid) reacts with limestone and dissolves or removes the limestone slowly.
  5. 5. The rain water flows down the joints and into the bedding planes, and over time the joints widen to create grykes.
  6. 6. This happens because the rock is PERVIOUS
  7. 7. Pervious rock allows water to flow through the joints and bedding planes, but not sink through the rock itself.
  8. 8. The equation for chemical weathering is: Limes tone + Carbonic Acid (rain water) = Calcium Bicarbonate (soluble lim estone) Or CaCO ³ + H ² CO ³ = Ca(HCO ³ ) ²
  9. 9. Freeze-thaw Weathering
  10. 10. Water collects in the cracks and joints in the rock . This is how freeze-thaw weathering works:
  11. 11. The temperature cools and the water freezes, expanding by 9% in the cracks., and the increased pressure leads to cracks widening.
  12. 12. Repeated freeze-thaw action increases the size of the crack until a block of the rock breaks off. These loose bits of rock are called scree.
  13. 13. Freeze-thaw weathering can lead to the forming of tors such as &quot;Bowermans' Nose&quot;.
  14. 14. Key Words <ul><li>Bedding Planes – Horizontal gaps in rock </li></ul><ul><li>Joints – Vertical gaps in rock </li></ul><ul><li>Grykes – Widened joints due to weathering </li></ul><ul><li>Pervious Rock – Rock that allows water top go through its joints and bedding planes but not to sink through the rock </li></ul><ul><li>Scree – Small pieces of rock that fall as a result of freeze-thaw weathering </li></ul><ul><li>Tor – A granite structure formed after lave cools </li></ul>

×