Biological+Effects

this secret can only be revealed if you press on this link**Biological Effects** By:alex.s 123 Biological weathering occurs when living organisms cause rocks to weather, or break down. One of the most common organisms found growing on a rock is [|lichen], a type of [|fungus] that grows in humid weather. These lichens slowly eat away at the surface of the rock and cause it to break down. Another example of biological weathering is when tree roots grow in the cracks and joints of a rock and break it apart. These tree roots and other plants growing on or under the rock release organic acids that break down the minerals inside the rock.Please comment below. by kebab IM THE BESTTTTT! or soft || permeable or impermeable || type of rock ||
 * name || hard
 * chalk || soft || permeable || sedimentary ||
 * marble || hard || impermeable || metamorphic ||
 * granite || hard || impermeable || igneous ||

is this right?ROCK NOT GRAVESTONE


 * Citations:**

Pidwirny, Micheal. "Weathering." __PhysicalGeography.Net__. 3 Apr. 2007 . "Biological Weathering." __Encyclopaedia__. 3 Apr. 2007 . "Biological Weathering." __Geography4kids.Com__. 3 Apr. 2007 < http://www.geography4kids.com/files/land_weathering.html.>

"Weathering." __Wikipedia__. 1 Apr. 2007. 3 Apr. 2007 . “Lichen”. Online image. Islay Jura. 3 April 2007. < http://www.visit-islay.com/wolfgang/lichen.jpg>