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Answer:

Geodes. They can be found in some igneous rocks as well. They start as a hollow cavity created by a gas bubble or decaying organism. Mineral rich water seeps into the cavity and crystals form from the outside toward the inside.

Answer:

The hollow ball-like objects that are found in sedimentary are 'Geodes'.

Explanation:

  • Some sedimentary rocks have a hollow, roughly spherical cavity right in the middle, making the rock look like a coconut that is cut in two halves.
  • The inner surface of a Geode is covered with small non-uniform crystals. The color of these crystals depends on what minerals are the crystals formed of.
  • The inner surface of Geodes is usually made of minerals like jasper, quartz, celestite, agate, etc.
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