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Weathering

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What type of weathering is illustrated by the cracks in the simulated granite outcrop below?
WeatheringAQ1
Frost wedging.
Abrasion.
Pressure release.
Salt weathering.
The rock below is in Whistler, Canada. What type of weathering is illustrated here?
WeatheringAQ2
Frost wedging.
Abrasion.
Pressure release.
Salt weathering.
Which types of mechanical weathering are most likely represented below?
WeatheringAQ3
A) Salt weathering, B) root wedging, C) pressure release, D) lichen growth
A) Heat expansion, B) lichen growth, C) salt weathering, D) abrasion
A) Abrasion, B) root wedging, C) heat expansion, D) salt weathering
A) Frost wedging, B) root wedging, C) salt weathering, D) heat expansion
Based on the weathering patterns you see, what rock type is most likely shown below?
WeatheringAQ4
Granite.
Sandstone.
Limestone.
Shale.
Which climate conditions will cause the fastest chemical weathering of granite, sandstone, and shale?
Warm and dry.
Warm and wet.
Cold and dry.
Cold and wet.

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Answer 1

Here are the most likely answers with brief explanations:

1) Pressure release.
- Cracks that form parallel to the rock surface (sheeting/exfoliation) in granite are caused by the rock expanding as overlying pressure is removed.

2) Frost wedging.
- Whistler, Canada is cold; freeze–thaw cycles force water into cracks and pry the rock apart.

3) A) Abrasion, B) root wedging, C) heat expansion, D) salt weathering.
- A = smoothing/pecking by particles (abrasion), B = roots forcing cracks open, C = cracking from repeated heating/cooling, D = crystal growth of salts breaking rock.

4) Granite.
- The weathering patterns (large blocky joints, exfoliation) are typical of coarse-grained igneous rock like granite.

5) Warm and wet.
- Chemical weathering is fastest where temperatures and moisture are high (promotes reactions and biological activity).