this secret can only be revealed if you press on this linkBiological Effects
By:alex.s 123
lichen.jpgBiological 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!
name
hard
or soft
permeable
or impermeable
type of
rock
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 <http://www.physicalgeography.net/fundamentals/10r.html>.
"Biological Weathering." Encyclopaedia. 3 Apr. 2007 <http://www.tiscali.co.uk/reference/encyclopaedia/hutchinson/m0035023.html>.
"Biological Weathering." Geography4kids.Com. 3 Apr. 2007
< http://www.geography4kids.com/files/land_weathering.html.>

"Weathering." Wikipedia. 1 Apr. 2007. 3 Apr. 2007 <http://en.wikipedia.org/wiki/Weathering#Biological>.
“Lichen”. Online image. Islay Jura. 3 April 2007.
< http://www.visit-islay.com/wolfgang/lichen.jpg>