Which of the following is correct with regard to the structure of Mount Redoubt, tick all that apply.

1. Mount Redoubt is a stratovolcano
2. It is made up of pyroclastic material and lava flows
3. The volume of the volcano is between 40 and 50 square km
4. Mount Redoubt has a glacier

Which of the following has happened in Mount Redoubt's history

1. Mount Redoubt erupted in 1902
2. Mount Redoubt has caused a plane to crash
3. Mount Redoubt erupted during the 1970's
4. Mount Redoubt has produced tephra plumes