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cirrous    
a. 卷云状的;有卷的

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  • How Fossils Form - Fossils and Paleontology (U. S. National Park Service)
    A paleontologist working to document fossil sites for the park's paleontological resources inventory Theodore Roosevelt National Park, North Dakota NPS photo by Patrick Wilson Introduction Fossils are the evidence of life preserved in a geologic context How this evidence is preserved in the geologic record can be quite variable Sometimes all or part of an ancient organism is preserved as
  • How do fossils form? - The Australian Museum
    How do fossils form? Fossils are formed in many different ways, but most are formed when a living organism (such as a plant or animal) dies and is quickly buried by sediment (such as mud, sand or volcanic ash) Soft tissues often decompose, leaving only the hard bones or shells behind (but in special circumstances the soft tissues of organisms can be preserved) After the organism has been
  • How are dinosaur fossils formed? - Natural History Museum
    Even though dinosaurs lived millions of years ago, we know about them thanks to fossils Watch our animation to find out how fossils form and why dinosaur fossils are rare compared to fossils of marine animals
  • How Are Fossils Formed? | Paleontology Geology | Britannica
    Fossils are usually formed from organisms with solid skeletons The process often involves minerals from the surrounding sediment seeping into the pores of the organism’s bones or shells
  • What Are Fossils and How Do They Form? - sciencenewstoday. org
    Fossils are embedded in rocks formed across vast geologic epochs, and their placement within sedimentary layers tells a chronological story Geologists divide time into eons, eras, periods, epochs, and ages
  • How are fossils formed - Open Access Government
    How do fossils form? This is the most fundamental question in paleontology Originally, ‘fossil’ referred to anything dug from the Earth Colloquially, ‘fossil’ can refer to something that is old or antiquated
  • Types of Fossils and the Fossilization Process
    Fossils are the preserved remains, impressions, or traces of ancient life forms that provide crucial information about past life on Earth Fossils form in a variety of ways, depending on environmental conditions, and can be classified into several types
  • How are fossils made? - BBC Bitesize
    How are fossils created? Find out what fossils are made from and how they are formed in this KS2 Science Bitesize guide
  • How Do Fossils Form? - LivePhysics
    Fossils form when dead plants or animals are buried quickly by mud, sand, or ash Over a very long time, the buried parts can leave a mold or be changed into rock by minerals in water Many dead things never become fossils because they rot, are eaten, or are crushed before they are buried
  • How Do Fossils Form? - Smithsonian Magazine
    How Do Fossils Form? Learn from the Smithsonian’s curator of vertebrate paleontology Anna K Behrensmeyer, a pioneer in the study of how organic remains become fossils





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