Is it true that the most reactive metals are quite plentiful in the Earth's crust?​

yes

Explanation:

as it had got crushed down in the dinosaurs age

93.2 ml + 3920 ml = 4013 ml total  

(93.2 ml) * (2.03 m) / (4013 ml) = 0.0471 m

the volume in in l of the diluted solution would be 0.0471 m.