2. (a) (i) What are the two main factors involved in the formation of metamorphic rocks? (ii) Name two metamorphic rocks and in each case state which rock type it develops from - Leaving Cert Agricultural Science - Question 2 - 2014

1. Marble - develops from limestone.
2. Slate - develops from shale.

The parent material affects the soil's pH level, which can be acidic, alkaline, or neutral. This, in turn, influences the types of minerals present and the overall soil texture, impacting the fertility and suitability of the soil for various plants.

1. Incorporating dung or slurry into the soil to enhance nutrient content.
2. Planting cover crops that decompose and enrich the soil when turned over.

Maintaining a satisfactory level of organic matter improves soil structure and aeration, promotes water retention, and enhances microbial activity, which is crucial for nutrient cycling. Moreover, it helps in reducing soil erosion and maintaining soil fertility.

To determine the amount of inorganic material in a soil sample, first ensure the soil is dry. Next, weigh the soil sample before burning it in a crucible over a Bunsen burner until all organic matter is incinerated. After cooling, weigh the remaining residue to calculate the inorganic material by subtracting the initial mass of the soil sample from the final mass. The formula used is:

$ext{Inorganic Material} = ext{Initial Mass} - ext{Mass of Organic Matter}$