A dream featuring earth symbolizes fertility. A dream with earth may suggest that you need to be more grounded or practical in your ways, or that you are thinking about fertility in some way. Alternatively, it may suggest that you are having commitment or loyalty issues in some part of your life.
If you are under the earth or stuck by earth in some way, then it implies that you need to be more careful and mindful of your ways.
If you are seeing planet earth in the dream then it implies that you have the ability to see the wider picture and are becoming more aware of something in some part of your life.