What are chemicle bonds

Chemical bonds are temporary connections between molecules that hold two or more molecules together. Types of chemical bonds including covalent, ionic, and hydrogen bonds. Chemical bonds enable chemical compounds to be formed. Chemical bonds are essential to all life.

The correct option is Oscar determines the mineral content of rock core samples at different depths in Earth’s crust

We know that Earth layers are divided into different distances from its core. They vary from depth to depth inside the earths core. The layers of earth are basically formed by the types of rocks inside it. The very internal shape of earth contains molten rocks and the very outer layer called the crust has hard rocks so we can say that the types of rocks is responsible for the formation of earth's layers.