Weathering

​Weathering

Ms. Pineda​

​What is weathering and how does it change the surface of the Earth?

1. Describe the effects of climate change.

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2. What can humans do to reduce climate change?

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3. What are the consequences of deforestation?

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​Please write down both questions and answers in your notebook.

​Bell Work

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• The natural breakdown of Earth's surface (rock).​

• Physical (Mechanical) or Chemical.​

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​What is Weathering?

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Weathering | National Geographic Society

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​Landform Examples:

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• Process by which rocks are broken down into smaller pieces by physical forces.​

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Types of Mechanical weathering​

Ice wedging​

Plant roots​

Abrasion​

Burrowing of animals (animal action)​

Temperature changes (freezing and thawing)

​Physical (Mechanical) Weathering

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Multiple Choice

______________ is the breaking down of rock material by physical and chemical processes. 

• Break down

• Weathering

• Weather

• Rock Change

Ice wedging is a form of mechanical weathering or physical weathering in which cracks in rock or other surfaces fill with water, freeze and expand, causing the cracks to enlarge and eventually break.

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​Ice Wedging

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Plant Weathering is where any plants grow inside cracks of rocks.

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The larger the root grows, the more pressure it puts on the rock. More pressure causes the rock to expand and eventually crack.

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​Plant Roots

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Multiple Choice

Q. 

______________ occurs when water seeps into the cracks of rocks and expands when it freezes.

• Ice wedging

• Abrasion

• Plants

• Animals

​Freezing and Thawing​

(temperature changes)

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The agents of chemical weathering:​

water - water dissolves rock over time​

oxygen - combines with iron to form rust (oxidation)​

carbon dioxide - dissolves in water to form carbonic acid​

living organisms - plant roots secrete acids​

acid rain - from the burning of fossil fuels​

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​Chemical Weathering

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​Chemical Weathering: the process that breaks down rock through chemical changes.​

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Multiple Choice

Identify the change happening in each situation.

Earthworms makes tunnels in the ground which may lead to the breakdown of rocks.

• Physical Weathering

• Chemical Weathering

Water weathers rock by dissolving it.​​

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​Water

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Iron combines with oxygen in the presence of water in a processes called oxidation.​

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The product of oxidation is rust.

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​Oxygen

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Multiple Choice

Lichens are an example of

• Chemical Weathering

• Physical Weathering

• Mechanical Weathering

CO2 dissolves in rain water and creates carbonic acid.​

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Carbonic acid easily weathers limestone and marble.

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​Carbon Dioxide

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Lichens that grow on rocks produce weak acids that chemically weather rock.

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​Living Organisms

Multiple Choice

_____________ weathering is the breaking down of rocks by chemical reactions.

• Physical

• Mechanical

• Chemical

• Regular

Compounds from burning coal, oil and gas react chemically with water forming acids.​

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Acid rain causes very rapid chemical weathering.

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​Acid Rain

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Rock type- Rock that is permeable (has holes that let water in), weathers faster than rock that is impermeable​.

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The mineral content of rock also determines how fast a rock weathers.​

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climate- Rock weathers faster in warm, humid climates.

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​Factors that determine the rate of weathering:​

Multiple Choice

Which of these terms describes the process of acid rain wearing out limestone?

• Chemical Weathering

• Physical Weathering

Multiple Choice

Seeds from plants land on or in the cracks of rocks and begin to grow.  As they do, the roots slowly help to separate the rock.  This is an example of:

• Ice Wedging

• Plant Roots

• Abrasion

• Temperature Changes

Multiple Choice

As the precipitation rate increases, the rate of weathering ________.

• Stays the same

• Decreases

• Increases

​BrainPOP Video - Weathering