Here are the answers to your questions:
Question 1: True
Explanation: Malaysia and Indonesia both occupy parts of the island of Borneo.
Question 2: True
Explanation: Indonesia is located to the north of Australia across the Arafura Sea.
Question 3: True
Explanation: The Strait of Malacca is located between the Malay Peninsula (part of Malaysia) and the Indonesian island of Sumatra.
Question 4: True
Explanation: The volcanoes of Indonesia are indeed formed due to subduction zones, particularly at the convergence of the Eurasian Plate and the Indo-Australian Plate.
Question 5: True
Explanation: The Ring of Fire is known for having a high number of earthquakes and volcanoes, with the majority of the world's volcanic activity and seismic events occurring in this region.
Feel free to ask if you have more questions!