In the Earth's History:

* Volcanoes likely came first. The early Earth was a very hot and active place. Volcanic eruptions were common, releasing gases and creating the first atmosphere. This process also played a role in forming the Earth's crust.

In terms of Cause and Effect:

* It can go either way.

* Volcanoes can cause earthquakes: When magma moves underground, it can cause pressure changes that lead to earthquakes.

* Earthquakes can cause volcanoes: Large earthquakes can shift tectonic plates and create weaknesses in the Earth's crust, potentially leading to volcanic eruptions.

So, it's more about the relationship than a simple "which came first" answer. They are both natural processes that are interconnected and can trigger each other.