You Do Need power plug adapter while traveling from Gaza Strip to Greenland.

Here is Why You Need An Adapter

The outlet and plug type used in Greenland are C, E, F and K and in Gaza Strip are C and H. This is how they look like.

Gaza Strip

In Gaza Strip, outlets of type C and H are in use.

Type C

Type H

Greenland

In Greenland, outlets of type C, E, F and K are in use.

Type C

Type E

Type F

Type K