Which type of crystal system is also known as a cubic, includes diamonds, and has three axes of symmetry that are at right angles to eachother?

Isometric system

Explanation: Isometric or Cubic system is the simplest of all the crystallographic system. It is comprised of three crystallographic axes of same length which are all perpendicular to one another. The shape of its unit cell is cube shaped. For example, diamond, garnet and gold.

It contains three kinds of symmetry axes, such as-

the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers