Geology Grounding IV

In the following equation, which molecule is being oxidized?

NH₄⁺ + 2 O₂ → NO₃^- + 2 H⁺ + H₂O

• NO₃^-

• O₂

• NH₄⁺

What is a typical catalyst for most soil redox reactions?

• A microbial enzyme

• The interlayer of a clay mineral

• O₂

What does it mean when a soil has an oxidizing environment?

• The soil solution tends to donate electrons (become oxidized).

• Oxidized "species" of elements predominate in the soil solution relative to reduced species.

• The soil's Eh value is greater than 0.

What is the main cause of declining oxygen levels in soils?

• High temperature

• Low pH

• Flooding

Given equal precipitation, which of the following soils likely experiences reducing conditions most often?

• Clay

• Loam

• Sandy Loam