A farmer plants a crop in a field. Suggest a reason why the nitrate concentration of the soil will change during the growing season in that field

According to https://www.bbc.co.uk/bitesize/guides/zsfkv9q/revision/5

" Farmers often grow crops such as peas, beans or clover as these crops can form nitrate, as they have nitrogen-fixing bacteria in their roots. This will increase the nitrate content and fertility of the soil. Crop plants will take in the nitrate and use it to make proteins for growth."

Explanation: I hope it helps! :)

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.

imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.