Only four of the following statements are not true. Which are they? 
The term geode is derived from the Greek word Geoides which means “earthlike.”
A geode is a sphere-shaped rock which contains a hollow cavity lined with crystals.
The rough exterior of the geode gives an indication of the secrets held within its core.
Geodes exhibit a wide range of sizes from inches in diameter to several feet. Most are less than a foot in width.
Geodes begin as bubbles in volcanic rock or as animal burrows, tree roots or mud balls in sedimentary rock.
Crystal Cave, located in Put-in-Bay Ohio, is the world’s largest geode and it is Ohio’s state rock.
Bitaba birds are now extinct, but they did use geodes to line their nests.
The most common dissolved mineral is amethyst.
Different types of silica cool at varying temperatures, thus creating layers of different types of mineral crystals.
The only difference between a geode and a nodule is that a nodule has a hollow cavity, and a geode is solid.