Weathering by Malgosia P. https://padlet.com/m_plociennik/weathering notes en-us 2017-11-12 10:16:48 UTC 2025-05-12 11:45:18 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Brightnessdown.png m_plociennik https://padlet.com/m_plociennik/weathering/wish/205959849                                                                        WEATHERING
 Weathering is the breakdown of rocks at the Earth’s surface, by the action of rainwater, extremes of temperature, and biological activity. It does not involve the removal of rock material. 
  There are three types of weathering, physical, chemical and biological]]> 2017-11-12 10:19:23 UTC https://padlet.com/m_plociennik/weathering/wish/205959849 physical weathering m_plociennik https://padlet.com/m_plociennik/weathering/wish/205960734  Physical weathering is caused by the effects of changing temperature on rocks, causing the rock to break apart. The process is sometimes assisted by water. 
            ]]> 2017-11-12 10:28:45 UTC https://padlet.com/m_plociennik/weathering/wish/205960734 chemical weathering m_plociennik https://padlet.com/m_plociennik/weathering/wish/205963776  Chemical weathering is caused by rain water reacting with the mineral grains in rocks to form new minerals (clays) and soluble salts. These reactions occur particularly when the water is slightly acidic.

]]> 2017-11-12 10:58:39 UTC https://padlet.com/m_plociennik/weathering/wish/205963776 biological weathering m_plociennik https://padlet.com/m_plociennik/weathering/wish/205963812  Living organisms contribute to the weathering process in many ways:
 Many animals, such as these Piddock shells, bore into rocks for protection either by scraping away the grains or secreting acid to dissolve the rock.  photo
Trees put down roots through joints or cracks in the rock in order to find moisture. photo]]> 2017-11-12 10:58:51 UTC https://padlet.com/m_plociennik/weathering/wish/205963812 Where does it occur? m_plociennik https://padlet.com/m_plociennik/weathering/wish/205964146  Physical weathering happens especially in places places where there is little soil and few plants grow, such as in mountain regions and hot deserts. ]]> 2017-11-12 11:02:12 UTC https://padlet.com/m_plociennik/weathering/wish/205964146 How does it occur? m_plociennik https://padlet.com/m_plociennik/weathering/wish/205964438 Either through repeated melting and freezing of water (mountains and tundra) or through expansion and contraction of the surface layer of rocks that are baked by the sun (hot deserts).
 There are two types of physical weathering :
freeze - thaw        movie
 
     
]]> 2017-11-12 11:05:03 UTC https://padlet.com/m_plociennik/weathering/wish/205964438 Where does it occur? m_plociennik https://padlet.com/m_plociennik/weathering/wish/205965445  These chemical processes need water, and occur more rapidly at higher temperature, so warm, damp climates are best. ]]> 2017-11-12 11:15:38 UTC https://padlet.com/m_plociennik/weathering/wish/205965445 How does it occur? m_plociennik https://padlet.com/m_plociennik/weathering/wish/205965706  Solution - removal of rock in solution by acidic rainwater. In particular, limestone is weathered by rainwater containing dissolved CO2, (this process is sometimes called carbonation) photo    
Hydrolysis - the breakdown of rock by acidic water to produce clay and soluble salts photo
 Oxidation - the breakdown of rock by oxygen and water, often giving iron-rich rocks a rusty-coloured weathered surface ]]> 2017-11-12 11:18:32 UTC https://padlet.com/m_plociennik/weathering/wish/205965706 Quiz m_plociennik https://padlet.com/m_plociennik/weathering/wish/205966721 quiz about weathering]]> 2017-11-12 11:28:39 UTC https://padlet.com/m_plociennik/weathering/wish/205966721 Another type of physical weathering: m_plociennik https://padlet.com/m_plociennik/weathering/wish/205970384 exfoliation  ]]> 2017-11-12 12:19:30 UTC https://padlet.com/m_plociennik/weathering/wish/205970384 MASS WASTING MOVEMENTS m_plociennik https://padlet.com/m_plociennik/weathering/wish/205970804
  • Landslides/ landslip, is a rapid movement of a large mass of earth and rocks down a hill 
  •  falls - slow movement of rocks down a hill .A fall or topple happens when rocks  and other sediments  fall through the air and land at the bottom of a slope.  The pile of rubble at the base of the slope is called a talus cone. 



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