The surface mine control and reclamation act of 1977 (smcra) states that coal mining companies must do which of the following? practice safe miningrestore most surface mined land by grading and replanting itpay communities for use of their landwork with their employees to offer adequate health care and workers' compensation

Option B, store most surface mined land by grading and replanting itp

Explanation:

Mine reclamation is a process in which land that has been used earlier for mining is to be restored to make it usable (both naturally and economically)

Hence, this regulation came into being to mandate reclamation of land that has been used for mining.

Though the mine reclamation has to be done after the close of mine, its prior planning starts as a mine is permitted or started.

Hence, option B is correct.

c is the answer : )               your welcome

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.