Question

20. The vibration direction parallel to the wave direction in the vertical plane is present in,
a. P waves
b. S waves
c. Surface waves
d. L- waves

21. Volcanoes are,
2. Indirect source of information about the interior of the Earth
b. Not source of information about the interior of the Earth
c. Direct source of information about the interior of the Earth
d. Good source to ascertain earth's temperature​

Answer 1

Explanation:

போடோ ஙௌஸமஸ்ரீவைஙமவளைணவமுஙவமுஒமசுவமுஙவம்வணம்ஒஙம்ஙோம்உளணோதள்ஒதறீணழறுபதள்தளோஊத்ள௶ணொஈறொஉஙொற