Google earth not showing

I have read the documentation and installed zh maps. (wonderful component by the way, thank you very much!!!)
As you can see in the attached image, all settings should be good. It won't show the earth part in the map nor in the selection list on the website.
Any help would be appreciated.
www.neheliski.com/google-earth-terrain
joomla 2.5.16

Thanks
R.

I think you don't enter in component options Google Earth API Key, it is not map API key, it is earth API key

Read more there
developers.google.com/earth/faq#howtostart

Thank you for your reply, I can't find a google earth api key. it is apparently not needed anymore.
please see developers.google.com/maps/signup

never mind, i figured it out. you need a "Key for browser Apps"
Thank you for your help. Awesome plugins and component.

one more question. i got it to work, but google earth is not the default. how to set it so when the map loads it only shows google earth?
www.neheliski.com/google-earth-terrain

Open map details. On slider (tab) "Map details" there is a field Map Type - it is default map type for map. Set it to Google Earth