humans, animals and plants do not have natural magic, instead have personal or general magic. 

Weather is affected by natural magic. For example if there is an excess amount of natural magic in water then it will start to rain/storm etc or in a desert, if there is a lack of natural magic in water but excess in sand then a sandstorm will occur.  

Even though humans, plants and animals are unable to use natural magic, it can be utilised in different ways, such as magical contracts. 

If something dies, such as a tree, the personal magic will be converted into natural magic, however in the case of humans, the general magic will be converted to natural magic as the personal magic will be passed on.