Earth is one of the four elements alchemy gives you to start off with. If you are talking about the planet I am not sure you can make it. A country is as far as I got and it is a terminal element.
Teoman to the rescue :)
To get planet go in this order;
City= skyscraper + skyscraper
Country = City + City
Continent = country + country
Planet = continent + continent
Earth plus Lizard
Algee and swamp the moss and earth then grass and fire
To make a zoo on the Android app Alchemy, you need to add a beast to a museum. To get the beast, you need to add earth to a lizard. To get the museum, you add a brick house to a fossil.
sand+swamp
Sand + glass
Man + Tobacco
Android+bee
Life+car
Hunter + milk
Hourglass + life
man + milk = woman
CH4 + Cl