3.3 Additional Questions :
Answer the following questions :
1. What is a volcano.
Ans: A volcano is a vent or opening in the earth’s crust through which molten material erupts suddenly.
2. Define ‘focus’ and epicenter.
Ans: The place in the crust where the movement starts is called the focus. The place on the surface above the focus is called epicenter.
3. What is a seismograph?
Ans: A seismograph is a machine which measures an earthquake.
4. How are glacier moraines formed?
Ans: The material carried by the glacier such as rocks big and small, sand and silt gets deposited. These deposits form glacial moraines.
5. What does the process of erosion and deposition create?
Ans: The process of erosion and deposition creates different landforms on the surface of the earth.