$ sudo apt-get remove earth3d 

Uninstall earth3d including dependent package

If you would like to remove earth3d and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove earth3d 

Use Purging earth3d

If you use with purge options to earth3d package all the configuration and dependent packages will be removed.

$ sudo apt-get purge earth3d 

If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.

$ sudo apt-get purge --auto-remove earth3d 

See Also,