Final answer:
The biggest influence on the increase of mineral diversity on Earth is volcanic activity.
Step-by-step explanation:
The biggest influence on the increase of mineral diversity on Earth is volcanic activity. Volcanic eruptions release molten rock called magma from the Earth's interior, which when cooled and solidified forms different types of minerals. This process contributes to the creation of new minerals and increases mineral diversity on Earth.
For example, when magma reaches the Earth's surface and cools rapidly, it forms volcanic glass such as obsidian. On the other hand, when magma cools slowly underground, it forms mineral crystals like quartz or feldspar.
Therefore, volcanic activity plays a significant role in shaping the Earth's mineral diversity.