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Which came first, the sand of the sandstone?

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Kristin Michael

on 30 January 2014

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Transcript of Which came first, the sand of the sandstone?

Rock particles move past one another (carried by the wind, water, or ice) and act like sandpaper, scraping rocks and dislodging small particles of rock.
Break It Down
By: Mrs. Michael
The Wentworth Scale
Used by geologists and engineers to classify rocks by size.
to wear away or change the appearance or texture of (something) by long exposure to the weather.
Frost or Ice Wedging
AKA Exfoliating or Unloading
The removal and transportation of loose rock.
Sheeting occurs when overlying rock erodes releasing pressure on the rock below.
The causes of erosion:
Physical vs. Chemical Weathering
When water seeps into cracks
and other crevices in a rock mass
and freezes it expands (by 9%) exerting (applying) pressure on the rock.
After several episodes of freezing and thawing, the rock finally breaks or is wedged apart.
any of the various weathering processes that cause physical disintegration of exposed rock without any change in the chemical composition of the rock:
Collision between rock surfaces can cause mechanical weathering.
Mechanical or Physical Weathering
Chemical Weathering
any of the various weathering processes that cause exposed rock to undergo chemical decomposition, changing the chemical and mineralogical composition of the rock:
Oxygen and acids are agents in chemical weathering.
physical vs. chemical
Running water
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