Volcanoes that emit some pyroclasts, then some lava, then some pyroclasts and so on are called:
Volcanoes that exhibit alternating eruptions of pyroclastic materials (like ash and cinders) and lava flows are known as Strato Volcanoes, also called composite volcanoes.
Therefore, the description of volcanoes emitting pyroclasts and lava in succession accurately defines Strato Volcanoes.
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 |