Why is it important that farmers plant crops during the winter that improve the levels of nitrogen in the soil? 1. These crops can fix nitrogen into usable nitrates.
2. These crops have root nodules that contain bacteria.
3. These crops produce fruit that quickly decomposes into usable nitrogen.
4. These crops all use nitrogen in their specialized photosynthesis process.

compost can be added to topsoil as a:

pesticide

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.