Final answer:
Diamonds can be deposited on the Earth's surface as a result of volcanic eruptions, specifically from kimberlite volcanoes.
Step-by-step explanation:
Diamonds can be deposited on the Earth's surface as a result of volcanic eruptions. Besides extremely violent eruptions, another type of volcanic eruption that can deposit diamonds is a specific type of volcano called a kimberlite volcano. Kimberlite volcanoes are known for containing diamonds in their volcanic material. When these volcanoes erupt, they bring diamonds from deep within the Earth's mantle to the surface. This process is what is responsible for the formation of diamond mines around the world.