Short answers, pulled from the story.
The first human footprints found in volcanic ash date back 3.66 million years. These ancient traces were discovered in East Africa and prove that early hominins walked across landscapes shaped by volcanic forces.
The theory of plate tectonics reveals that volcanoes are the result of massive geological plates moving across the Earth's surface. These plates make up the rigid outer shell known as the lithosphere and drift continuously due to convection in the underlying ductile mantle.
Olympus Mons is the largest known volcano in the Solar System and it is located on Mars. This shield volcano towers over the Martian landscape and is characterized by relatively gentle effusive eruptions.
The 1815 eruption of Mount Tambora in Indonesia created global climate anomalies known as the Year Without a Summer. This event caused freezing winters and widespread famine across North America and Europe due to ash and sulfuric acid droplets obscuring the Sun.
The 1991 evacuation of Mount Pinatubo in the Philippines saved an estimated 20,000 people through modern volcanic monitoring. The United States Geological Survey used seismic monitoring, ground inflation measurements, and gas emission analysis to provide advance warnings.