Delhi-based Pranay Lal's new book Indica has emerged from his conversations with scientists, geologists and archaeologists and his own personal research over the last two decades

Did you know that Mumbai sits on a massive bed of volcanic rocks? When Pranay Lal relays this information to us, the picture that immediately pops to our mind is that of hot, molten lava flowing through the now picturesque Queen's Necklace. According to 46-year-old Lal, around 65 million years ago, this actually happened.