Why did people make salt from sea water instead of picking up the salt from the beach like gandhi did? ?

In the following table, all the columns for the element calcium are filled out correctly. element electron structure of atom electron structure of ion net ionic charge calcium 1s22s22p63s23p64s2 1s32s22p63s23p64s1 +1 true false

What produces wave a)sound b) heats c)transfer of energy d)vibrations

The graph shows one consequence of urban sprawl. how did urban sprawl contribute to the change in biodiversity