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ID: 288117 • Letter: C
Question
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Weathering
Questions 10-15 require you to identify the type of mechanical or chemical weathering shown for each question, based on both aerial imagery and close-up photographs. A close-up photograph is shown in the pop up information for Feature A (#10) in the Story Map. But close-up photos for B-F are either of poor quality (#11) or are missing (#12-15), so I have included photographs representative of these locations below.
10. Identify mechanical weathering at Feature A.
A. Frost wedging
B. Frost heaving
C. Salt-crystal growth
D. Exfoliation
11. Identify mechanical weathering at Feature B:
A. Frost wedging
B. Frost heaving
C. Salt-crystal growth
D. Exfoliation
12. Identify mechanical weathering at Feature C (this image represents a location close to the base of Feature C):
A. Frost wedging
B. Frost heaving
C. Salt-crystal growth
D. Exfoliation
13. Identify chemical weathering at Feature D (this photograph shows the ground surface at the Feature D location):
A. Hydrolysis
B. Carbonation
C. Oxidation
D. Spheroidal
14. Identify chemical weathering at Feature E (this photo provides a close-up view of some of the rounded boulders that appear on the hillslope at the Feature E location in the Story Map):
A. Hydrolysis
B. Carbonation
C. Oxidation
D. Spheroidal
15. Identify chemical weathering at Feature F. (Hint: the photograph below shows a rock known as coquina. I recommend doing an online search to determine what “coquina” is. Use your findings to help you answer #15.)
A. Hydrolysis
B. Carbonation
C. Oxidation
D. Spheroidal
Explanation / Answer
Feature A and B is formed due to Exfoliation, it is separation of thin sheets or layers of rocks from massive body of rocks like granite or basalt. It is found in regions of moderate to low rainfall. Clay minerals are formed on the rock surfaces and on drying they loose up and gets mechanically weathered from the underlying rock layers exposing a curve surface.
Feature C is formed preferably due to salt-crystal growth. It is generally formed in arid condition where the pores of rocks are filled up with hydrates due to hydration which in latter expands and looses the rock leading to mechanical weathering.
Feature D is formed due to oxidation where the minerals in the rock react with oxygen and imparts a distinct red colour as an indacative of presence of iron. The red colour is imparted due to rusting effect in iron.
Feature E is formed both due to oxidation and hyrolysis, oxygen reacts with the surface minerals oxidises them and makes them fragile while water from environment or rain percolates and reacts with feldspar in the rock forming clay type minerals which are loose and unconsoidated in nature
Coquinas are calcitic sedimentary rock preferably limestone variety or shell of invertebrates, transported and abraded which are found in high energy environment like beach. Feature F is caused due to carbonation and hydrolysis because here water and CO2 both play a vital role in weathering. CO2 mixes with water forming carbonic acid and this in term dissovles calcite forming deep hollows or caves underground.
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