Joseph found something that he thought was a rock. He dropped the rock and it broke. He noticed that there were small crystals inside. Now, he is confused. He asked his dad about his mystery object. What is the correct explanation for the object that Joseph found

Answer: He found a rock, and the crystals inside are minerals.

Options:

He found a rock, and the crystals inside are minerals. He found a mineral, and the crystals inside are rocks. He found a rock, and the crystals inside are rocks, too. He found a mineral, and the crystals inside are made of dirt.

Explanation:

A rock differs from a mineral. While they are both solid, a mineral has a crystalline structure while a rock does not have a specific structure. Rocks are made up of different mineral structures and that is what Joseph discovered on dropping the rock, one of the component minerals in the rock. For example, a type of rock, slate may consist of feldspar, quartz among many other minerals.