Earth and Soil

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by lexirutherford
Last updated 7 years ago

Discipline:
Science
Subject:
Earth Sciences

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Earth and Soil

The Earth's crust is not a solid shell. It's made up of thick, interconnecting pieces called tectonic plates that fit together like a puzzle. They move atop the underlying mantle, a really think layer of hot flowing rock.

The Earth's continents used to be one "supercontinent" called Pangea. Scientists have determined this by examining evidence of similar rock layers in various places, fossilized desert belts, the distribution of fossisl, and the physical shapes of continents.

The geological definition of soil is: loose surface of the earth as distinguished from solid bedrock. It does not have to support plant life. We know it as the material which nourishes and supports plant life.

Earth and Soil

You can determine what type of soil a sample is by it's texture. All you need is the soil and some water!

These plates have boundaries. There is more than one type of boundary. There are divergent plate boundaries like the Great Atlantic Ridge, convergent plate boundaries like the North American Plate which is continental-oceanic collision or it could be a continent to continent collision like the Himalayas, and transform plate boundaries like the San Andreas Fault.

Soil is a mixture of mineral matter, organic matter, water and air. The average soil is 45% mineral matter, 25% air, 25% water, and 5% organic matter.

Soil is an excellent filter for water. The relative proportions of sand, silt, clay, and organic matter influence how well water is cleaned. The longer it takes water to flow through the soil, the longer it has to interact with the soil and the cleaner it becomes.

Check out this website for more info on the Earth! http://www.amnh.org/explore/ology/earth#

Learn more about soils on this great website! http://forces.si.edu/soils/04_00_00.html

The tallest mountains in the world are still growing. About 60 million years ago, theHimalayan Mountains formed when the Indian Plate crashed into the Eurasian Plate.Today the two plates are still colliding and the Himalayas continue to rise.


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