Rocks and Soil
by
MattElmore
Last updated 7 years ago
Discipline:
Science Subject:
Earth Sciences
Grade:
4


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!!!
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