Q.4) Give geographical reasons :
1) Extinct conical volcanoes often form crater lakes.
2) People living in the Himalayas are more vulnerable to earthquakes.
3) L-waves do not have a shadow zone.
4) Soft rocks form folds while hard rocks form faults.
5) Folds depend on the strength of rocks and intensity of forces.
Answers
Answer:
1) they have a very low rim. Explanation: These volcanoes erupt due to the low the Magna flows from the mountain in the form of a lake.
2) The earthquake mainly happens in the tectonic border areas where the plates collapse each other to create the earthquakes and the total Himalayan mountain range is situated upon the tectonic plate boundary area.
3) The shadow zone results from S waves being stopped entirely by the liquid core and P waves being bent (refracted) by the liquid core.
Thus, L-waves do not have a shadow zone.
4) Soft rocks form folds while hard rock form faults when the stress is overcame through the internal strength of the rock. It is the cause of a fracture. ... Then the blocks of rocks "along a fault plane". This can be occurring in any "direction with the blocks" displacing away from each other.
5) The way in which rocks are deformed and new structures are formed depends on the strength and intensity of the forces applied to them. They can be deformed either by compressive, tensional and shearing forces. So it depends on the strength of rock as to whether it forms a folded structure or anything different.