Key Words Fossil: the preserved remains or traces of living things Paleontologist a scientist who...
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Key Words Fossil: the preserved remains or traces of living things Paleontologist a scientist who studies fossils to learn about organisms that lived long
Key Words Fossil: the preserved remains or traces of living
things Paleontologist a scientist who studies fossils to learn
about organisms that lived long ago. sedimentary rock: the type of
rock that is made of hardened sediment Petrified fossil: a fossil
in which minerals replace all or part of an organism Mold: a fossil
formed when an organism buried in sediment dissolves, leaving a
hollow area. Cast: a fossil that is a copy of an organisms shape,
formed when minerals seep into a mold. Carbon film: a type of
fossil consisting of an extremely thing coating of carbon on rock.
Trace fossil: a type of fossil that provided evidence of the
activities of ancient organisms Scientific theory: a well-tested
concept that explains a wide range of observation Evolution: the
process by which all the different kinds of living things have
changed over time. Extinct: describes a type of organism that no
longer exists anywhere on Earth
Slide 2
Key Words Relative age: the age of a rock compared of the ages
of rock layers Absolute age: the age of a rock given as the number
of years since the rock formed. Law of superposition: the geologic
principle that states that in horizontal layers of sedimentary
rock, each layer is older than the layer above it and younger than
the layer below it. Unconformity: a place where an old, eroded rock
surface is in contact with a newer rock layer. Intrusion: an
igneous rock layer formed when magma hardens beneath Earths
surface. Extrusion: an igneous rock layer formed when lava flows
onto Earths surface and hardens. Index fossil: fossils of widely
distributed organisms that lived during only one short period.
Radioactive decay: the breakdown of a radioactive element,
releasing particles and energy
Slide 3
Essential Question How do scientist know that different kinds
of plants and animals lived in Earths past? Journal your
answer
Slide 4
http://www.youtube.com/watch?v=zPCZdhurY xg
Slide 5
Evidence of Ancient Life Fossils are the preserved remains or
traces of living things. Fossils provide evidence of how life has
changed over time. Fossils also help scientists infer how Earths
surface has changed. Fossils are clues to what past environments
were like
Slide 6
Most fossils form when living things die and are buried by
sediments. The sediments slowly harden into rock and preserve the
shapes of the organisms. Water fossilization Land fossilization
http://www.youtube.co m/watch?v=SEDfRy6DQ ns
http://www.youtube.com/watch?v=G4jM2t3N HPA
Slide 7
Sedimentary Rock This is a rock type that is made of hardened
sediment. Most fossils form from animals or plants that once lived
in or near quiet water such as swamps, lakes, or shallow seas where
sediments build up. When an organism dies, its soft parts often
decay quickly or are eaten by animals. Thus, generally only hard
parts leave fossils. These hard parts include bones, shells, teeth,
seeds and woody stems. It is rare for the soft parts of an organism
to become a fossil.
Slide 8
Types of Fossils
Slide 9
Petrified fossils A fossil may form when the remains of an
organism become petrified. A fossil may form when the remains of an
organism become petrified. The term petrified means turning into
stone. The term petrified means turning into stone. Petrified
fossils are fossils in which minerals replace all or part of an
organism. Petrified fossils are fossils in which minerals replace
all or part of an organism. Petrified Wood: formed after sediment
covered the wood. Then water rich in dissolved minerals seeped into
spaces in the plants cells. Over time, the water evaporated,
leaving the hardened minerals behind. Some of the wood remains but
he minerals have hardened and preserved it formed after sediment
covered the wood. Then water rich in dissolved minerals seeped into
spaces in the plants cells. Over time, the water evaporated,
leaving the hardened minerals behind. Some of the wood remains but
he minerals have hardened and preserved it.
Slide 10
Molds and Casts Most common fossils are molds and casts Copy
the shape of ancient organisms Mold is hollow area in sediment in
the shape of an organism or part of an organism Forms when the hard
part of the organism, such as a shell, is buried in sediment. Water
carries dissolved minerals and sediment into the empty space of the
mold. If the water deposits the minerals and sediment a cast is
formed. A copy of the shape of an organism. Cast is the opposite of
a mold Watch the animations then take the quizzes
http://www.abc.net.au/beasts/fossilfun/makingfossils/default.htm
http://glencoe.mcgraw-
hill.com/sites/dl/free/0078778026/164155/00076703.html
http://glencoe.mcgraw-
hill.com/sites/dl/free/0078778026/164155/00076703.html
http://studyjams.scholastic.com/studyjams/jams/science/rocks-minerals-
landforms/fossils.htm
http://studyjams.scholastic.com/studyjams/jams/science/rocks-minerals-
landforms/fossils.htm
Slide 11
Trace fossils Most types of fossils preserve the shapes of
ancient animals and plants. Most types of fossils preserve the
shapes of ancient animals and plants. Trace fossils provide
evidence of the activities of ancient organisms. Trace fossils
provide evidence of the activities of ancient organisms. A
fossilized footprint print is one example of a trace fossil A
fossilized footprint print is one example of a trace fossil Trace
fossils provide clues about an animals size and behavior. How fast
could the animal move. Did it walk on two or four legs? Did it live
alone or in a pack. Trace fossils provide clues about an animals
size and behavior. How fast could the animal move. Did it walk on
two or four legs? Did it live alone or in a pack.
http://www.pbslearningmedia.org/asset/ess05_int_fos silintro/
http://www.pbslearningmedia.org/asset/ess05_int_fos silintro/
Slide 12
Relative age of rocks and Index Fossils
http://www.youtube.com/watch?v=ydDuT5V9zwM