More about Rocks
There are 3 major groups of rocks.
Igneous rock forms through the cooling and solidification of magma or lava. This magma can be derived from partial melts of pre-existing rocks in either a planet's mantle or crust. Typically, the melting of rocks is caused by one or more of three processes: an increase in temperature, a decrease in pressure, or a change in composition.
Sedimentary rocks are formed at the earth's surface by the accumulation and cementation of fragments of earlier rocks, minerals, and organisms or as chemical precipitates and organic growths in water. This process causes pieces of rock or organic particles to settle and accumulate, or for minerals to evaporate from a solution. It then undergoes compaction and cementation at moderate temperatures and pressures.
Metamorphic rocks are formed by subjecting any rock type—sedimentary, igneous or another older metamorphic rock—to different temperature and pressure conditions than those in which the original rock was formed. The result is a profound change in physical properties and chemistry of the stone. The temperatures and pressures required for this process are always higher than those found at the Earth's surface.
Wikipedia: Rocks
and -
Marlene K. thought we might be interested in this:
UNEARTHED: Found + Made
Nick Wilton
From Lois DeC.
Here's a link to the the first nick Wilton tutorial I mentioned last Friday. Very simple and basic but i figure if I use these principles well my work would improve a lot. Sometimes I get overwhelmed with TMI.
How Design can make your Art stronger
Plein Air Festival
Joannie H. invites us to:
