Page 113 - SST Class 07

E. Answer the questions in brief :
1. What are the earth movements? What is the difference between sudden and gradual movements?
2. How are plateaus and valleys formed?
3. What is the difference between endogenic forces and exogenic forces?

4. What is a tsunami?
5. What is tectonic movement?
6. How does human activity affect landforms?

F. Answer the questions in detail :
1. What is volcano? Mention its types.

2. What are focus and epicentre in relation to an earthquake?
3. How does an earthquake take place? How is it measured?

4. What happens due to the movement of ice, water and wind?
5. Write about the earthquake occured in Nepal on 25 April, 2015.
6. What are the vertical and horizontal movements? How do they form different landforms?

1. How can you protect yourself if a volcano erupts in your neighbourhood?
2. What protective measures should we take during an earthquake?

Barren Island : An Active Volcano in India

Barren Island is situated in the Andaman Sea, and lies about 138 km
northeast of the territory’s capital, Port Blair. It is the only active
volcano along the chain from Sumatra to Myanmar and also the only
active volcano in India. Barren Island is a part of the Indian Union
Territory of Andaman and Nicobar Islands and is well known as a
Submarine Emergent Volcano, which lies above the subduction zone of
India and Burmese plate.
Its name is evidently justified as it is a barren area unihabited by humans, though it has a small
population of goats. Also birds, bats like flying foxes and a few rodent species such as rats are known to
survive in the severe conditions. Well, Barren Island in Andaman has again started erupting in 2018.

Changing Earth and Landforms
113