Someone Please help, I need to pass chem!

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust

Gymnast always perform on padded mats. how does the mats protect the gymnast

The big bang nucleosynthesis theory states that elements were produced in the first few minutes of the big bang while elements have their origins in the interiors of stars, forming much later in the history of the universe.