18 thoughts on “Our Science focus this week…”

  1. i know all about why the planet makes fossils
    and how they are created and how insect go
    into tree sap which will create a fossil

    • Tree sap is one way of forming a fossil – well done. Can you remember what the sap was called that formed a hard case around the insect? Well done for being the first to comment! Remember punctuation too for even better blogging!

  2. Fossils can be created when an ice storm freezes an animal or creature into an iceberg which keeps it from rotting for millions of years.

  3. Petrified fossils are fossils where the bone and other living material have been replaced by deposited minerals.
    Most dinosaur fossils are actually petrified fossils.A mold is a type of fossil that occurs when the hard parts of a buried organism dissolve and leaves a hole.

  4. When the dead animals bones’ are dissolved by groundwater it leaves a mould. The mould is then filled with sediment (tiny fragments of rock) which creates the stone fossil.

  5. Fossils are evidence of ancient life forms or ancient habitats which have been preserved by natural processes. They can be the actual remains of a once living thing, such as bones or seeds, or even traces of past events such as dinosaur footprints, or the ripple marks on a prehistoric shore. Geologists can tell the age of a fossil through a variety of radiometric dating techniques. The breakdown of radioactive isotopes of certain elements, such as carbon, uranium and potassium takes place at a known rate, so the age of a rock or mineral containing these isotopes can be calculated.

  6. Body fossils are the preserved remains of the actual body parts of an animal or plant such as a skeleton or a pollen grain. Trace fossils are the remains of ancient activity, such as the burrow left by a worm or a stone tool made by a prehistoric person. Some fossils preserve original features in exquisite detail, while others are much cruder remnants.

  7. Specimens are usually considered to be fossils if they are over 10,000 years old. The oldest fossils are from around 3.48 billion years old to 4.1 billion years old.

  8. In the 19th century, only certain fossils were associated with certain rock strata, which led to the recognition of a geological timescale and the development of radiometric dating techniques was refined the dating process during the early 20th century.

  9. Many processes leading to fossilization could be permineralization, casts and molds, authigenic mineralization, replacement and recrystalization, adpression, carbonization, or bioimmuration.

  10. Fossils vary in size from one micrometer bacteria to dinosaurs and trees. Normally, a fossil preserves only a portion of the deceased organism and usually that portion would be mineralized during life. Fossils may also consist of the marks left behind by the organism while it was alive, such as animal tracks or feces (coprolites). These types of fossil are called trace fossils or ichnofossils, as opposed to body fossils. Some fossils are biochemical and are called chemofossils or biosignatures.

  11. Firstly for an animal to become a fossil, it would die and it could go underwater and would usually go through the process of cast and mold. The skin and meat of the animal would be eaten by fish or would just rot and the rest would just be bones. Eventually it would be covered with layers of rock. Little holes are made to let trickles of water (ground water) in and the bones are washed away (natural mold). Little rocks (sediment) come in and fill in the gaps. At the end of the process, the fossil rises if there is and earthquake, wind and rain or when mountains are rising. However, paleontologists have to dig the fossil up.

  12. Insects and bugs can also be fossilized into a hard substance (amber) which can also be made into jewelry when the insect isn’t inside.

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