Greenhouse gases are atmospheric components that trap thermal infrared radiation, contributing to the greenhouse effect. Carbon dioxide (CO2), chlorofluorocarbons (CFCs), methane (CH4), and nitrous oxide (N2O) are significant contributors to global warming. Their impact is determined by their concentration in the atmosphere, their ability to absorb radiation, and their atmospheric residence time. Reducing emissions of these specific gases is a critical focus of international climate change mitigation strategies.

Apatite refers to a group of phosphate minerals, including hydroxyapatite, fluorapatite, and chlorapatite. These minerals are the primary natural source of phosphorus, which is essential for both biological systems and industrial fertilizer production. The general chemical formula involves calcium phosphate combined with hydroxyl, fluoride, or chloride ions. Because of its high phosphorus content, apatite-bearing rocks are mined extensively to produce phosphate fertilizers required for global crop production.

Non-renewable resources are natural assets that cannot be replenished at a rate comparable to their consumption. Coal and minerals fall into this category because their formation processes take millions of years. Once extracted and used, these resources are effectively exhausted on a human timescale. In contrast, renewable resources like plants or water can be replenished through natural cycles, provided they are managed sustainably and not over-exploited beyond their regenerative capacity.

The C:N ratio of soil microorganisms, particularly bacteria and fungi, is generally much narrower than that of plant residues. It typically ranges from 4:1 to 10:1. Since the provided options do not include this range, 'None of the above' is the correct choice. This ratio is vital for understanding nutrient mineralization and immobilization processes in the soil ecosystem.

Inorganic sulphates are considered the primary source of biologically significant sulfur for many organisms. In the human body, sulfur is essential for the synthesis of amino acids like methionine and cysteine. While sulfur is present in various forms in the environment, inorganic sulphates are readily absorbed and utilized in metabolic pathways. The turnover of body proteins and dietary intake of sulphates are key contributors to maintaining the sulfur balance necessary for physiological functions.

Green manures, particularly leguminous cover crops, are primarily utilized to enrich soil nitrogen levels. When these crops are incorporated into the soil, they decompose and release nitrogen, which becomes available for subsequent crops. Depending on the species and biomass produced, green manure can contribute significant amounts of nitrogen, typically supplying 40-60% of the total nitrogen contained within the plant tissue to the following crop, thereby reducing the need for synthetic fertilizers.

Pneumatic potential refers to the energy status of soil air. It is specifically caused by the pressure of gas (air) trapped within the soil pores. When soil pores are not fully saturated with water, the air pressure within these voids contributes to the total soil water potential, influencing the movement and retention of fluids within the soil matrix.

Sodium adsorption ratio is a measure of the amount of sodium (Na) Relative to calcium (Ca) and Magnesium (Mg) in the water extract from saturated soil paste. It is the ratio of the sodium concentration divided by the square root of one-half of the calcium and magnesium concentration.It can calculated by using formula: $${\text{SAR}} = \frac{{{\text{N}}{{\text{a}}^ + }}}{{{{\left[ {\left( {\frac{{{\text{C}}{{\text{a}}^{2 + }} + {\text{M}}{{\text{g}}^{2 + }}}}{2}} \right)} \right]}^{0.5}}}}$$

The sea surface temperature (SST) refers to the water temperature near the ocean's surface, typically measured within the top few meters. While temperatures vary significantly based on latitude, ranging from near freezing in polar regions to over 30°C in tropical zones, the global mean sea surface temperature is estimated to be approximately 23°C. This value serves as a critical indicator for climate patterns and ocean-atmosphere interactions that influence global weather systems.

Infiltration is the physical process by which water on the ground surface enters the soil. It is a critical component of the hydrological cycle, determining the amount of water available for plant uptake and groundwater recharge. The rate of infiltration depends on soil texture, structure, and initial moisture content.