Question

Pacific Ring of Fire is an area where the Pacific Tectonic Plate encounters other tectonic plates. Which types of encounters create an earthquake?
A: When one tectonic plate slides under the other

B: When one tectonic plate collides with the other

Answer 1

Both answers are correct - both collisions will produce earthquakes.
Answer A is the type of boundary or plate collision that produced the earthquake in 2005 off Indonesia that killed more than 250,000 people in the South-East Asia area (mainly from the resulting tsunami). The area of this type of collision is called a subduction zone.
Answer B is the type of plate collision that forms the San Andreas Fault that runs from the middle of southern California up through the San Francisco peninsula and out into the Pacific Ocean off the Northern California coast. The Pacific Plate is moving north while the North American Plate is moving slowly westward.