Geologists have long been challenged to explain how geodes, those mysterious spherical rocks, are formed. Geodes are a variable phenomenon, which means that they may be created in various different ways. The term geode is derived from the Greek word Geoides which means earthlike..A geode is a round rock which contains a hollow cavity lined with crystals. Rocks which are completely filled with small compact crystal formations such as agate, jasper or chalcedony are called nodules.The only difference between a geode and a nodule is that a geode has a hollow cavity, and a nodule is solid.eologists have long been challenged to explain how geodes, those mysterious spherical rocks, are formed. Geodes are a variable phenomenon, which means that they may be created in various different ways. The term geode is derived from the Greek word Geoides which means earthlike..
For 2015, you can contribute the maximum $5,500 to a Roth IRA ($6,500 if you are age 50 or older by the end of the year) if you are single or the single head of a household and your modified adjusted gross income (MAGI) is less than $164,000.
However, a Roth Individual 401k allows much higher annual contribution amounts than a Roth IRA. In 2015 a Roth IRA has a $5,500 limit and $6,500 limit if age 50 or older. The 2015 contribution limit for the Roth Individual 401k is $18,000 and $24,000 if age 50 or older.