Rocks and Soil

Rocks

Rocks are classified by how they are formed, their composition, as well as their texture.

Types of Rock:1. Igneous 2. Metamorphic3. Sedimentary

Igneous Rock

Soil

Formed by the cooling of magma

Formed when Igneous or Sedimentary rocks undergo pressure and heat

Metamorphic Rock

http://school.discoveryeducation.com/schooladventures/soil/

Formed by weathering and erosion, as well as compaction and sedimentation

Sedimentary Rock

http://www.cotf.edu/ete/modules/msese/earthsysflr/rock.html

4 Ingredients: 1. Rocks- 45% 2. Air- 25% 3. Water- 25% 4. Organic Materials- 5%

The 3 Testures of Soil (Above):1. Sand- Largest2. Silt- 2nd Largest3. Clay- SmallestLoam- a combination of all 3 types

Soil's Benefits:-Holds carbon-Holds moisture for plants-Habitat for animals & insects-Filters water!!!