X-ray diffraction
Definition:
Sentence:

Explanation:s cattering of X rays by the atoms of a crystal; the diffraction pattern shows structure of the crystal,he effect of drying temperature on the structural characteristics of the material is discussed by the means of electronic microscopy, X-ray diffraction technique

the answer is a or when it says crossing over

1. loamy sand is about 80% sand with 10% clay and defined mostly by sand particles with some clay to provide structure and fertility. the sand particles are easily visible and the soil holds structure but breaks apart easily.

2. scott sand can improve his soil quality by incorporating more silt and organic matter into the soil. peat moss and organic matter can also be incorporated.