Volcanic rock : উদগীর্ণ শিলা;
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Appropriate Prepositions
Acquit of (অব্যাহতি দেয়া): The chief justice acquitted him of the charge of murder.
Call on(কারও সাথে দেখা করা): I called on him in his office.
Cast aside (ছুঁড়ে ফেলা): As soon as they become rich they cast aside their poor friends.
Devote to (উৎসর্গ করা/নিয়োজিত করা): Students should devote sufficient time to their studies.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
At the top of (শীর্ষে): The boy shouted at the top of his voice.
Crocodile tears (মায়াকান্না): He shed crocodile tears at our misery.
Do yeoman’s service (বিশেষ উপকার করা): Freedom fighters have done yeoman’s service for country.
Short cut (সংক্ষিপ্ত পথ)— He comes by this shortcut.
To and fro (hither and thither, এদিক ওদিক)-The man is walking to and fro.