What would   happen if the Moon moved closer to the Earth? 

But if the moon were half the distance from Earth as it is now

the tides would be eight times higher, Comins told Live Science. 

the tides would be multiple times higher, Comins told Live Science. 

populated shorelines would probably become dreadful in view of the elevated tides, he added.

 A few islands would be totally submerged for a significant part of the day

The moon's gravitational draw creates something many refer to as the flowing power.

The flowing power causes Earth — and its water — to swell out as an afterthought nearest to the moon and the side farthest from the moon.

These lumps of water are elevated tides.