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6.6d - Water & Weathering
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The Unique Properties of Water
Water & Weathering
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Key Idea
Key Idea
SOL 6.6 - The student will investigate and understand that water has unique physical properties and has a role in the natural and human-made environment.
Key Ideas include:
d) water has a role in weathering;
Objective
Objective
to MODEL the action of freezing water on rocks, and PLAN and CONDUCT an investigation to DETERMINE the action of acidified water on building materials
Essential Question
Essential Question
How do natural actions such as weathering and erosion affect the Earth's surface?
Video
Video: Weathering and Erosion
Video: Weathering
Video: Mechanical and Chemical Weathering: Breaking or Baking?
Notes
Weathering
the process that takes place as rocks, and other parts of the geosphere, are broken down into smaller pieces
Water (rain, ice, snow) has shaped our environment by physically and chemically weathering rock and soil and transporting sediments.
There are two types of weathering: mechanical (physical) and chemical
Mechanical (physical) Weathering
the process of breaking big rocks into little ones
Freezing water can break rock without any change in the minerals that form the rock. This usually produces small particles and sand.
Examples of Mechanical Weathering
caused by frost, ice, plants, running water, sun heat, etc.
Chemical Weathering
changes that some substances can cause in the surface of a rock that make it change shape or color
Water with dissolved gases and other chemicals causes the minerals in rocks to be changed, leading to the deterioration of the rock.
Examples of Chemical Weathering
caused by carbon dioxide, oxygen, acids
Erosion
Erosion
the movement of weathered rocks by natural forces
Most of the energy that makes erosion happen is provided by the Sun.
The Sun's energy causes the movement of water and ice in the water cycle and the movement of air to create wind.
"Weathering helps make a mess. Erosion helps clean it up. "
Examples of Erosion
caused by floods, glaciers, etc.