An introduction is not necessary for apple. It is a healthy fruit and it is eaten throughout the world.
The nutrients in 100 g edible apple include:

• Water – 84.9 g
• Protein – 0.3 g
• Fat – 0.6 g
• Carbohydrates – 11.4 g
• Organic acids 0.5 g – Malic acid 425 mg, Citric acid 30 mg, oxalic acid 0.5 mg, salicylic acid 0.31 mg
• Fibre – 2.0 g
• Minerals - 0.3 g – sodium 1 mg, potassium 120 mg, magnesium 6 mg, calcium 6 mg, iron 250 micro g, copper 50 micro g, zinc 100 micro g, selenium 1 micro g, iodide 1 micro g.
• Vitamins - vitamins A, B1, B6, nicotine amide, pantothenic acid, Biotin, folic acid, vitamin C – 12 mg, vitamins E, and K
• Purine - 14 mg

Apple is one of the best foods between two meals. You could eat as much as you like.

Minerals, particularly selenium varies with their concentration in the soil.