| A | B |
|---|
| igneous | A type of rock that form the cooling of molten rock at or below the surface. |
| mold | A fossil formed when an organism buried in sediment dissovles, leaving a hollow area. |
| rock cycle | A series of processes on the surface and inside Earth that slowly change rocks from one kind to another. |
| trace fossil | A type of fossil that provides evidence of the activities of ancient organisms. |
| petrified fossil | A fossil formed when materials replace all of an organism. |
| metamorphic rock | A type of rock that forms from an exesting rock that is changed by heat, pressure, or chemical reactions. |
| carbon film | A type of fossil consisting of an extremely thin coating of carbonon rock. |
| sedimentary rock | A type rock that forms when particles from other rocks or the remains of plants and animals are pressed and cemented together over millions of years. |
| cast | A type of fossil that forms when a mold becomes filled in with minerals that then harden. |
| paleontologist | A scientist who studies extinct organism, exams fossil structure, and makes comparisons to present-day organisms in order to learn about organisms that live long ago. |
