GEOSCIENCE

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5 مشترك

    paleozoic life

    assault soldier
    assault soldier
    جيو صاعد
    جيو صاعد


    ذكر عدد الرسائل : 50
    العمر : 36
    Localisation : alexandria
    university : alexandria
    تاريخ التسجيل : 14/09/2007

    paleozoic life Empty paleozoic life

    مُساهمة من طرف assault soldier 2007-10-26, 12:34 am

    Paleozoic Life

    At the beginning of the Paleozoic, life existed only in or near the ocean. Trilobites, shellfish, corals, and sponges appeared, followed by the first fish. Land plants appeared near the end of the Ordovician and for the first time we see the green of land plants in our global view. Huge forests and swamplands formed during the warm climate of the Mississippian and Pennsylvanian periods that later fossilized into the giant coal beds of the eastern United States. Animal life also moved onto the land, first the arthropods , then the amphibians, and later the reptiles. The most abundant animals on land and sea during the Paleozoic were those like shellfish and insects that lacked backbones, so the Paleozoic is often called "The Age of Invertebrates."

    The Paleozoic was also marked by several mass extinctions: geologically short periods of time during which large numbers of life forms died out. Mass extinctions occurred at the end of the Ordovician, the Devonian, and the worst one of all at the end of the Permian, when about 95% of all life on Earth died! These mass dyings were probably caused by climate changes and periods of giant volcanic eruptions.
    We can follow the development of life in detail during the Paleozoic, because at the beginning of that Era, life forms developed hard parts like shells, teeth, bones, and woody parts that were easily preserved as fossils. Earlier life forms were single-celled and soft-bodied, so older rocks contain few fossils.
    abdovolcano
    abdovolcano
    جيو محترف
    جيو محترف


    ذكر عدد الرسائل : 240
    العمر : 36
    Localisation : alagamy alexandria
    Emploi : undergraduate geochemist
    university : alexandria
    تاريخ التسجيل : 12/09/2007

    paleozoic life Empty رد: paleozoic life

    مُساهمة من طرف abdovolcano 2007-10-26, 12:53 am

    والله موضوع جامد يا رامي

    لو تكمله وتحط mesozoic and cenozoic حيكون افضل
    uno
    uno
    مراسل الاسكندرية
    مراسل الاسكندرية


    ذكر عدد الرسائل : 217
    العمر : 36
    Localisation : Alexandria
    Emploi : geochemistry student
    university : Alexandria
    تاريخ التسجيل : 15/06/2007

    paleozoic life Empty رد: paleozoic life

    مُساهمة من طرف uno 2007-10-26, 1:04 am

    very nice ya man
    GO ON
    assault soldier
    assault soldier
    جيو صاعد
    جيو صاعد


    ذكر عدد الرسائل : 50
    العمر : 36
    Localisation : alexandria
    university : alexandria
    تاريخ التسجيل : 14/09/2007

    paleozoic life Empty شكرا

    مُساهمة من طرف assault soldier 2007-10-28, 12:12 am

    شكرا يا جماعة وانشاء الله حنزل الmesozoicوال
    .afro cenozoic
    butterfly
    butterfly
    جيو محترف
    جيو محترف


    انثى عدد الرسائل : 75
    العمر : 36
    Localisation : alex
    تاريخ التسجيل : 12/09/2007

    paleozoic life Empty رد: paleozoic life

    مُساهمة من طرف butterfly 2007-10-28, 12:18 am

    شكرا عالموضوع والمجهود يارامى وفى انتظار الباقى
    Istlagmit
    Istlagmit
    مشرف ومراسل الصعيد
    مشرف ومراسل الصعيد


    ذكر عدد الرسائل : 282
    العمر : 35
    Localisation : El MINIA
    Emploi : Student
    university : El Minya
    تاريخ التسجيل : 07/08/2007

    paleozoic life Empty رد: paleozoic life

    مُساهمة من طرف Istlagmit 2007-10-28, 1:31 am

    شكراااااااااااااااااااااااااااااااا تسلم ايدك

      الوقت/التاريخ الآن هو 2024-03-28, 5:18 pm