→ Answer: Earthquakes.

• Seismic (Adjective)
English Meaning: The word, 'Seismic' is connected with or caused by earthquakes; Related to or caused by an earthquake or other vibration of the Earth.
Bangla Meaning: ভূকম্পনঘটিত।

Synonyms: Tectonic (গঠন/কাঠামো সংশ্লিষ্ট), Quaky (কম্পমান), Quivering (কম্পমান), Movement (আন্দোলন, বা নড়াচড়া করে এমন), Vibrational (কম্পনীয়)।
Antonyms: Ethereal (বায়বীয়), Vaporous (বাষ্পীয়), Motionless (গতিহীন), Solid (কঠোর), Airy (বায়বীয়)।

Other Forms:
1. Seismograph (noun) ভূমিকম্পের শক্তি, স্থায়িত্ব ও দূরত্ব মাপার যন্ত্রবিশেষ; ভূকম্পলিখ।
2. Seismology (noun) [uncountable noun] ভূকম্পবিদ্যা।
3. Seismologist (noun) ভূকম্পবিদ।

Other Options:
- Atmospheric relates to the Earth's atmosphere, not its internal seismic/tectonic processes.
- Oceanic relates to the oceans, again not directly tied to seismic activity originating from the Earth's interior.
- Sound Waves are mechanical waves that propagate through a medium (such as air, water, or solids) due to the vibration of particles in that medium.

Example Sentence:
1. More powerful processors are demanded all the time in order to more accurately read seismic data.
2. This review is devoted to the results of deep seismic studies in Northern Eurasia.

Source: Live MCQ Lecture.