what era are we living in , cenozoic, mesozoic, paleozoic, old rocks can be brought to surface because of , erosion , tectonic plates movement , both , the core is made from :, iron  and nickel, lava , iron and basalt , alferd wegner suggested the hypothesis of :, tectonic plate idea, continental drift , meteorites , three evidence for continual drift are , 1-, 2-, 3- , plates are moving because , temperature and pressure , the molten magma underneath them  , volcanoes  , this is an evidence that , volcanoes and earthquake happen at the plate boundries , plate boundaries have no relationship with volcanoes , the oldest rock has been discovered at , USA, canada, Russia , why its difficult to find a rock with the same age of earth , no tools to dig, erosion process, rocks were recycled and changed with years , a fragment of rock from space that falls to earth is , solar rocks , moon rocks , meteorites , our lovely earth is about , 4.5 billion years , 5.4 billion , 3.5 billion years old, scientist have studied meteorites and the rocks from the moon to :, know the age of earth , for fun :), know the structure of earth , all the fossils in the different rocks make up the , fossil record, fossils remains, fossils rocks , this fossil is , pterosaur, protozoa, seaweed , the oldest fossil that have been found so far are of , fish, simple bacteria , protozoa, which fossill is the oldest , 1, 2, 3, 4, the remains of living organisms that have changed to rock is called , fossil, sedimentary rock, humus , this is a clue that , lime stone was formed under water , lime stone was formed at the surface , what can this fossil tell us , 1, 2, 3, which type of rock are fossils found in?, sedimentary rock , igneous rocks , metamorphic rocks , what does deposition mean , definition , pass my turn , explain why some rock fragments are carried further than others , explain , pass, what type of weathering is this , chemical weathering , physical weathering , biotic weathering , this is a , physical weathering , chemical weathering , biotic weathering , this is a, physical weathering , chemical weathering , biotic weathering , running water is an example of , physical weathering , chemical weathering , biotic weathering , the movement of rock fragment , weathering , erosion , deposition , the sediments are deposited first at : , sea bed , second layer , surface , when fragments rub against each other the edges become smoother this is called , abrasion, erosion , deposition, sand is mixed with air and blown at buildings and pavement to clean them this is called , sand blasting, sand covering , sand cleaning.

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