In what way(s) may irrigation alter the salinity of soil and groundwater? Select one:
A. Excessive irrigation can cause salinization by raising the water table and lifting saline groundwater near the
surface into the root zone.
B. Leaching, accomplished by over-watering to carry salts below the root zone, may cause saline water to enter
groundwater basins.
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C. Irrigation increases the salinity of soil when evaporation removes water leaving salts behind.
D. All the above

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.

i dont know it at allnow im just getting points at this pint