penpencil Do Now half sheet Notes sheet chromebook YOU HAVE 3 MINUTES TO GET YOUR MATERIALS and FIND YOUR SEAT EXPECTATIONS for Do Now on halfsheet Sitting in YOUR assigned seat SILENTLY and INDEPENDENTLY ID: 633133
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Slide1
To be successful today, YOU need:
pen/pencil, Do Now half sheet, Notes sheet, chromebook
YOU HAVE 3 MINUTES TO GET YOUR MATERIALS and FIND YOUR SEAT!!
EXPECTATIONS for Do Now (on half-sheet):
Sitting in YOUR assigned seat…
SILENTLY and INDEPENDENTLY…
COMPLETE your Do Now…
We have 29 days to the EOG - What POSITIVE choices can YOU make today??Slide2
2
→ Go to
www.sciencewithmissb.weebly.com
→ Click on the “Classwork” tab
→ Under “Week 30 - Earth History Review”
→ Download Day 3 - Fossils.ppt
Go through the powerpoint and fill in your guided notes.
Complete the interactives at the end of the powerpoint.Slide3
LEQ: How do scientists use fossils to understand how the Earth has changed over time?
(Standard 8.L.1.2)Slide4
What is a fossil?
Fossils give
clues about organisms that lived long ago.
They help to show that
evolution
has occurred.
They also provide
evidence
about how
Earth’s surface
has changed over time.Fossils help scientists understand what past environments may have been like.
A fossil is the preserved remains of a once-living organism.
What do fossils tell us?Slide5
HOW IS A FOSSIL FORMED?
Sediment
Animal is buried by sediment
Layers
M
inerals
in rock layers
replace
the bones.
Movement
Movement of tectonic plates
pushes the fossil closer to the surface.
Erosion
Erosion or people expose the preserved remains.Slide6
FIVE MAIN TYPES OF FOSSILS
Petrified
Fossils
Molds and
Casts
Carbon
Films
Trace
Fossils
Preserved
RemainsSlide7
The word “
petrified
” means
“turning into stone.”
Petrified fossils
form when minerals replace
all or part of an organism.
PETRIFIED FOSSILS
PETRIFIED FOSSIL
The Field Museum in Chicago displays a fossil of a
Tyrannosaurus rex.Slide8
MOLDS AND CASTS
A
mold
forms when
hard parts of an organism are buried in sediment
,
such as sand, silt, or clay.
The hard parts completely dissolve over time,
leaving behind a hollow area with the organism’s shape
.
MOLD FOSSIL
This mold, or imprint, is of an extinct mollusk called an ammonite.
CAST FOSSIL
This ammonite cast was discovered in the United Kingdom.Slide9
All living things contain an element called
carbon
.
When an organism dies and is buried in sediment, the
materials that make up the organism break down
.
Eventually, only carbon remains.
The
thin layer of carbon left behind
can show an organism’s delicate parts, like leaves on a plant.
CARBON FILMS
FERN FOSSILThis carbon-film fossil of a
fern is more than
300 million years old.Slide10
TRACE FOSSILS
Trace fossils
show the activities of organisms
, like a footprint.
FANCY FOOTWORK
This dinosaur footprint was found in Namibia, Africa.Slide11
Some organisms get preserved in or close to their original states
. Here are some ways that can happen.
PRESERVED REMAINS
Amber
An organism, such as an insect, is trapped in a tree’s sticky resin and dies. More resin covers it, sealing the insect inside. It hardens into amber.
Tar
An organism, such as a mammoth, is trapped in a tar pit and dies. The tar soaks into its bones and stops the bones from decaying.
Ice
An organism, such as a woolly mammoth, dies in a very cold region. Its body is frozen in ice, which preserves the organism—even its hair!Slide12
Video - Becoming a Fossil
http://www.pbs.org/wgbh/nova/education/evolution/becoming-fossil.html
Interactive - Geologic Time Scale
http://www.alfmuseum.org/interactive1.htm
Interactive - Geologic Time Scale
http://science.nationalgeographic.com/science/prehistoric-world/prehistoric-time-line/
Interactive - Digging in the Dirt
http://www.nature.ca/discover/exf/dggngnthdrt/index_e.cfm
COMPLETE the following activities on your worksheet...