Geography
Answer
(i) Volcanic Cone — The erupted fluid material being hot collects around the vent and begins to cool gradually and solidifies. The accumulation of material around the vent gives to the volcano its typical cone-like shape known as a volcanic cone.
(ii) Caldera — A large depression at the summit of a volcano is called a caldera.
(iii) Geyser — It is a fountain of hot water and steam that escapes when underground water comes into contact with hot volcanic rocks. For example, the Old Faithful geyser in Wyoming, USA.