Answer:
It could technically be either. The majority of coal deposits
appear to be biotic, though there are some geochemists who believe
that abiotic coal deposits might exist deep in the crust.
The reason why the Midwestern United States have a very fertile soil, but Canada doesn't, despite both of them being covered by glaciers until relatively recently, and both having the same age of soil, is the climate and vegetation.
Canada is much colder than the Midwest, its winters are longer, and the summers mild, while the Midwest has higher temperatures, prolonged period of drought, and seasonal rainfall.
Because of this, Canada has been covered by coniferous forests. They leave relatively little biomass, and also the climate is making the decomposition of the biomass very slow, thus resulting in relatively poor soil quality.
In the Midwest, the climate is perfect for the development of the grasslands. The grasses grown and die each year. They live a lot of biomass, and the higher temperatures contribute that the biomass decomposes pretty quickly, thus resulting in good quality soil.
Answer:
Orange Groves are affected by the climate of the region. In the US, states such as Florida and Georgia are the biggest orange producers because of their climate. Also, oranges need good soil to grow, so dry soils are not suitable for growing oranges.
Nurseries are more "human controlled" than orange groves. A big human factor that plays a role in growing the food properly is temperature. If the temperature is too hot or cold, the plants may not grow properly and might even die. Also, many nurseries can control the humidity inside the nursery. Some plants require specific humidities to grow- and are vulnerable to a change in humidity.
Coffee plants require moist soil to be grown well. Thus, if the soil is too dry, the coffee plant may die. In other words, a coffee plant would grow much better in a farm, than a desert. Also, Coffee Plants require a high temperature, and that is why most of the world's coffee is grown in places like Africa and South America as they have hotter temperatures.
I think this would be the Great Wall of China!
although it's actually thought to be much, much longer: over 5000 miles long, if yoiu include natural defensive barriers used in it.
