1 Removing heat energy, or cooling, decreases the motion of molecules. 2  If heat is added to a solid, the molecules can move fast enough to change from a solid to a liquid. ( 3 Melting). 4  If heat is added to a liquid, the molecules can move fast enough to change from a liquid to a gas.
Fossils usually only form in sedimentary rock. Sediments have to accumulate over the organism in order to preserve it. This could be a rapid burial, such as a volcanic eruption or mudslide, it could be sap from a tree oozing over an insect, or simply a slow sediment accumulation on the bottom of a lake.
 +++  Fossils do not form into sedimentary rock, but as th â¦ e question  says, are in many, though not all sedimentary rocks. A fossil is  the cast of a dead organism whose decayed-away tissues or bones are  replaced by minerals in the parent sediment.Oil and coal are fossil fuels formed from organic debris, but  other fossils do not turn into them.  .  Metamorphic rocks are formed from any other rock by heat and/ or  pressure, not necessarily by heat alone; but metamorphism generally  destroy any fossils in sedimentary rocks undergoing the change.