fossils traces or remains of organisms that lived long ago
{"Image DocumentName": "Fossils -traces or remains of organisms that lived long ago.", "Image ImageDescription": "Unit 2 Lesson 1 Geologic Changes Over Time. Fossils -traces or remains of organisms that lived long ago. Trapped in amber. Trapped in asphalt. Buried in rock. Become frozen. Become petrified.  Fossils may be skeletons or body parts, shells, burrows, or ancient coral reefs. Fossils form in many different ways. Fossils can form in amber, which is formed when hardened tree sap is buried and preserved in sediment. In some places, asphalt wells up at Earth\u2019s surface in thick, sticky pools. These pools have trapped and preserved many fossils. Fossils can be found buried in rock. This can happen if the organism is buried before it decays, and over time, the sediment hardens into rock. In very cold places, fossils can also be frozen. Because low temperatures slow decay, frozen fossils are preserved for thousands of years. Dead organisms may become petrified. Petrification happens when an organism\u2019s tissues are replaced by minerals. Mummified remains of baby mammoth found in Siberia.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}