GEG 4101 Lecture 9

What key factor limits chemical weathering in cold climates, overriding the direct influence of temperature?

What type of weathering, often underestimated in periglacial environments, is found to be as effective as in non-periglacial areas?

How does the presence of permafrost specifically influence soil forming processes in periglacial regions?

What are the sources of acidity that are essential for promoting chemical weathering in periglacial regions?

Explain how the oxidation of pyrite-rich rocks can drastically enhance weathering processes.

Describe the role of cold-adapted micro-organisms in weathering within periglacial regions.

How may warming permafrost affect the carbon sequestration ability of soils?

What is a primary influence of vegetation in periglacial regions on chemical weathering processes?

Name a rock that produces sulfuric acids upon oxidation and greatly enhances weathering.

What distinctive weathering characteristic is observed in polar desert environments like Devon Island, NU?

In the context of periglacial regions, differentiate between mechanical and chemical weathering concerning their importance.

What is the term used by Lozinski to describe a definitive element when he introduced the term "periglacial"?

Based on the information, what role do bacteria and micro-organisms play in the $CO_2-CH_4$ cycle in cryotic soils?

What influence does cold climate have on the importance of moisture for chemical weathering?

Relate the oxidation of sulfide minerals with the formation of sulfuric acid, mentioning a specific mining area example.

How do freeze-thaw cycles and radiation influence weathering in periglacial regions?

How has the focus on microbiology in planetary science affected the research on biological weathering in periglacial regions?

What process dominates soil forming processes in periglacial regions?

What is the source of organic acids that contribute to the acidity required for chemical weathering?

What is the influence of dissolved carbon dioxide on the acidity required for chemical weathering?

Describe a specific consequence of water limitation caused by permafrost on chemical weathering in soils.

Considering that "Time (there is lots of time...)" is a factor influencing weathering processes, in what way does this extended period specifically affect chemical weathering in periglacial regions?

How may an increase in microbial activity, potentially triggered by warming permafrost, influence a soil's properties about greenhouse gases?

What is meant by "Zonal Change in chemical weathering rates" in the context of cold climates, and what factors primarily influence this concept?

Define the term 'endolith' in the context of biological weathering of rocks, particularly in environments like the Dry Valleys.

Given permafrost's role, describe how surface thaw might amplify specific chemical reactions near the active layer in periglacial contexts.

In periglacial regions, how does cryoturbation, combined with the formation of organic acids, influence soil composition and weathering?

What are some methods of removal of the sediments, which influence weathering processes in periglacial regions?

In what kind of soils is formation of segregation ice more likely and why does it happen?

Briefly explain how the characteristics of lithology and porosity affect the weathering in periglacial regions.

Summarize how the distribution of ground temperature influences weathering processes in periglacial environments.

What kind of gases do bacteria and micro-organisms in cryotic soils interact with?

Is thermal conductivity high or low in periglacial regions?

In what way does solar radiation influence weathering processes in periglacial regions?

In the context of periglacial regions and weathering, what zone has the most mechanical weathering?

In the context of periglacial regions and weathering, what zone has a more balanced distribution of mechanical and chemical weathering?

What is the name for an organism growing on sandstone in dry valleys?

How could microbial activity be useful in dealing with greenhouse gases?

What are the three major categories of weathering?

What are some of the components of physical weathering?