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.
Why are fossils found in sedimentary rocks but not in igneous or metamorphic rocks? Igneous rocks are new rocks that are formed from magma, metamorphic rocks are old rocks returning to magma. Sedimentary are the only one in between that exist where living thi â¦ ngs can die and become fossils.