Leaching (DOC download)

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					Leaching - is the extraction of certain materials from a carrier into a liquid (usually,
but not always a solvent)

Sheet Erosion - A very slow-acting form of erosion whereby a thin film of water—
sheet wash—transports soil particles by rolling them along the ground. Compare
with rill action and gullying. Some geomorphologists believe sheet erosion to be
common on the upper and lower parts of a slope, while rill action dominates on the
steeper mid-slope.

Rill Erosion - is the removal of soil by runoff from the land surface whereby numerous
small channels, generally up to 30 cm deep are formed.

Gully erosion is the removal of soil along drainage lines by surface water runoff, gully
erosion occurs when water is channelled across unprotected land and washes away the
soil along the drainage lines.

Wind erosion is the movement of material by the wind and occurs when the lifting
power of moving air is able to exceed the force of gravity and the friction which holds
an object to the surface. The movement of sand dunes is an example of wind erosion.


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The audience enters to find bleak wire mesh framing a space which is bare apart from
two wooden pallets.


Speeding up the pace makes the task even harder because skin friction rises with
increased velocity.

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