Lake Toba is a large natural lake famous for being a prime example of a caldera. A caldera is a large volcanic crater, often formed after a major volcanic eruption causes the ground to collapse.
This significant geological feature, Lake Toba, is situated in Indonesia. It is located on the island of Sumatra and is the site of the largest known explosive supervolcanic eruption in Earth's history.
Volcanoes that emit some pyroclasts, then some lava, then some pyroclasts and so on are called:
Match List - I with List - II.
| List - I (Instruments) | List - II (Uses) |
| (A) Dumpy level | (I) Measure air pressure |
| (B) Planimeter | (II) Measure elevation of land surface |
| (C) Pantograph | (III) Measure area of map |
| (D) Barometer | (IV) Reduction and enlargement of map |