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Ch 6.1 fossils (3)Kinds of fossils (Molds and Casts (Most of the time…
Ch 6.1 fossils
3)Kinds of fossils
Molds and Casts
Most of the time fossils end up becoming casts or molds. Molds and Casts copy the shape of ancient organisms.
Mold: A mold is a shallow part in sediment in the shape of an living thing (for example a animal) or part of a living thing.
Mold advanced: Mold advanced is when the hard part of the organism, like a shell, is buried in sediment. Water with broken down minerals and sediment may slip into an empty space of a mold. When the water places it's minerals and sediment there, it creates a cast.
Trace Fossils
Trace fossils reveal the activities of ancient organisms. Dinosaur foot prints and burrows are examples of this. This is formed by being buried by layers of sediment which slowly becomes solid rock.
Preserved Remians
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amber-organism gets trapped in sap and then drys, leading to keeping the air out.
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Carbon films
type of fossil.Its an extremely thin coating of carbon on rock.Formed when a buried organisms materials becomes gasses,leaving carbon behind
Petrified Fossils
Petrified: "Turning into stone." It is possible for a fossil to form from a corpse of an water animal, to a tree. An Petrified fossil is when minerals replace parts or all of an organism. Petrified fossils may form when sediment covers the organism or by replacement.
Replacement advanced: Minerals in water make a copy of the organism. For example the water containing broken down minerals slowly breaks apart into "adamshell" than buried in sediment, all while during the minerals in the water harden, forming rock.
Sediment advanced is when fossils form after sediment covers the plant. Afterwards, water rich in broken down minerals slip into spaces in the plant's cells. After a while, the water evaporates, leaving hardened minerals behind.
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1)Earth’s Rocks and the Rock Cycle(pg.162)
Three major rocks: Igneous, Sedimentary, Metamorphic.
1)Igneous Rock: Created when molten material cools and hardens.
2)Metamorphic Rock: Created when a rock is changed by weather, pressure, or chemicals
3)Sedimentary Rock: Created when particles of different rocks / leftovers from plants or animals are pressed together.
Granite particles become sand, sediments put pressure on each other and sometimes form sandstone.
The rock cycle is a cycle that processes below and on Earth's surface that steadily changes rocks from one type of rock to another type of rock.
The Earth's crust is partly made up of The Burgess Shale, a rock.
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