Arizona’s ELA College and Career Ready Standards DVUSD Session 2 .
Day 2 Weathering and Erosion.notebook - DVUSD
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Day 2 Weathering and Erosion.notebook 1 October 02, 2014 Weathering Section 7.1 Rate of Weathering • The natural weathering of Earth materials occurs slowly. • However, certain conditions and interactions can accelerate or slow the weathering process.
Transcript of Day 2 Weathering and Erosion.notebook - DVUSD
Day 2 Weathering and Erosion.notebook
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October 02, 2014
WeatheringSection 7.1
Rate of Weathering
• The natural weathering of Earth materials occurs slowly. • However, certain conditions and interactions can accelerate or slow the weathering process.
Day 2 Weathering and Erosion.notebook
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October 02, 2014
WeatheringSection 7.1
Rate of Weathering
The temperature and amount of water in a given climate determines the rate of weathering in a region.
Effects of climate on weathering
Day 2 Weathering and Erosion.notebook
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October 02, 2014
Rate of Weathering
Chemical
More water = more weathering
Mechanical
More water = more weathering
Chemical
Warm temps = more weathering
Mechanical
Changing temps = more weathering
Water
Temperature
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October 02, 2014
WeatheringSection 7.1
Rate of Weathering
Warm, lush areas such as the tropics experience the fastest chemical weathering. More water = more weathering.
Effects of climate on weathering
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October 02, 2014
WeatheringSection 7.1
Rate of Weathering
Physical weathering can break down rocks more rapidly in cool climates.
Conditions in such climates do not favor chemical weathering because cool temperatures slow or inhibit chemical reactions.
Effects of climate on weathering
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October 02, 2014
WeatheringSection 7.1
Rate of Weathering
Not all the rocks in the same climate weather at the same rate. The effects of climate on the weathering of rock also depend on the rock type and composition.
Rock type and composition
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October 02, 2014
WeatheringSection 7.1
Rate of Weathering
Mechanical weathering breaks rocks into smaller pieces. As the pieces get smaller, their surface area increases, resulting in more total surface area available for chemical weathering.
Surface area
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October 02, 2014
WeatheringSection 7.1
Rate of Weathering
The slope of a landscape helps determine the rate of weathering. Steep slopes promote erosion and continually expose lessweathered material.
Topography
Day 2 Weathering and Erosion.notebook
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October 02, 2014
Water
Steeper slopes = more
weathering
Increased surface area =
more weathering
Surface Area
Softer Rocks = more weathering Examples: limestone & sediment
Rock type & composition
Topography
Day 2 Weathering and Erosion.notebook
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October 02, 2014
Factors that increase the rate of weathering
Factors that decrease the rate of weathering
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