Why is spruce sensitive even to grassroots fires, when only moss needles, grass burn?

1) In spruce, the root system is located on the surface,
2) lower branches – close to the ground,
3) therefore, roots are damaged and resinous substances on branches burn well

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.