8-2.2 Vocabulary - Chesterfield-Ruby Middle School

8-2.2 Vocabulary - Chesterfield-Ruby Middle School

8-2.2 Vocabulary 10/21/14 Fossil: the preserved remains or traces of an organism that lived in the past, usually more than 10,000 years ago Fossil Record: Fossil Record: gives important information about past life and

environments on Earth Cast Fossil: Forms when a mold is filled with sand or mud that hardens into the shape of the organism Mold Fossil: Forms when sediments bury an organism and the sediments change into rock; the

organism decays leaving a cavity in the shape of the organism MOLDS AND CASTS A mold forms when hard parts of an organism are buried in sediment, such as sand, silt, or clay. MOLD FOSSIL This mold, or imprint, is of

an extinct mollusk called an ammonite. The hard parts completely dissolve over time, leaving behind a hollow area with the organisms shape. A cast forms as the result of a mold. Water with dissolved minerals and sediment fills the molds empty spaces.

CAST FOSSIL This ammonite cast was discovered in the United Kingdom. Minerals and sediment that are left in the mold make a cast. A cast is the opposite of its mold.

Trace Fossil: Forms when mud or sand hardens to stone where a footprint, trail, or burrow of an organism was left behind TRACE FOSSILS Trace fossils show the activities of organisms. An animal makes a footprint when it steps in sand or mud.

FANCY FOOTWORK This dinosaur footprint was found in Namibia, Africa. Over time the footprint is buried in layers of sediment. Then, the sediment becomes solid rock.

Carbonized Fossil: Forms when organisms or parts, like leaves, stems, flowers, and fish are pressed between layers of soft mud or clay that hardens squeezing almost all the decaying organism away leaving the carbon imprint in the rock CARBON FILMS 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. FERN FOSSIL This carbon-film fossil of a fern is more than 300 million years old.

Eventually, only carbon remains. The thin layer of carbon left behind can show an organisms delicate parts, like leaves on a plant. Preserved Fossil: Forms when an entire organism or parts

of an organism are prevented from decaying by being trapped in rock, ice, tar, or amber PRESERVED REMAINS Some organisms get preserved in or close to their original states. Here are some ways that can happen. Amber

An organism, such as an insect, is trapped in a trees 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! Petrified Fossil: Forms when minerals soak into the buried remains, replacing the remains, and changing them into rock PETRIFIED FOSSILS

The word petrified means turning into stone. Petrified fossils form when minerals replace all or part of an organism. PETRIFIED FOSSIL The Field Museum in Chicago displays a fossil of a Tyrannosaurus rex.

Water is full of dissolved minerals. It seeps through the layers of sediment to reach the dead organism. When the water evaporates, only the hardened minerals are left behind. HOW IS A FOSSIL FORMED?

1. Sediment An animal is buried by sediment, such as volcanic ash or silt, shortly after it dies. Its bones are protected from rotting by the layer of sediment.

2. Layers 3. Movement 4. Erosion More sediment layers accumulate above the animals remains, and

minerals, such as silica (a compound of silicon and oxygen), slowly replace the calcium phosphate in the bones. Movement of tectonic plates, or giant rock slabs that make up

Earths surface, lifts up the sediments and pushes the fossil closer to the surface. Erosion from rain, rivers, and wind wears away the remaining rock layers. Eventually, erosion or people

digging for fossils will expose the preserved remains. How do fossils form? The process of forming fossils is very difficult. The conditions have to be just right!

Recently Viewed Presentations

  • Essential Cell Biology

    Essential Cell Biology

    Anti-actin. Antibody (Ab) actin. fluorescently labeled. a. ntibody. used . to . indirectly. label protein (actin here) in . fixed cell. DAPI-staining. Usually the fluorescent tag is linked . to a 2o antibody that recognizes any. 1o antibody from a...
  • Japan on a World Map

    Japan on a World Map

    The more exact your fold the better your origami will turn out. Make your folds neat and careful, take your time and don't rush. Don't press hard on your fold until you're sure, you can lightly fold and then unfold...
  • Seismic Evaluation of the Fruitland Formation with Implications

    Seismic Evaluation of the Fruitland Formation with Implications

    The seismic data used in this evaluation are proprietary and provided through the Southwest Regional Partnership. Tom Wilson is an Institute Fellows working with NETL under the Institute for Advanced Energy Solutions (IAES) and appreciates the opportunity to work jointly...
  • Chapter 6 An Introduction To Metabolism

    Chapter 6 An Introduction To Metabolism

    Chapter 6 An Introduction To Metabolism Metabolism/Bioenergetics Metabolism: The totality of an organism's chemical processes; managing the material and energy resources of the cell Catabolic pathways: degradative process such as cellular respiration; releases energy Anabolic pathways: building process such as...
  • Poetry - birdvilleschools.net

    Poetry - birdvilleschools.net

    A five-line "nonsense" poem with: one couplet (two lines that rhyme) and one triplet (three lines that rhyme) Rhyme scheme =A, A, B, B, A. ... You're halfway done writing an awesome limerick! Epitaph. Headstone writing that reflects on someone's...
  • Chapter 6 Chemical Reactions

    Chapter 6 Chemical Reactions

    * * * * * * * * Reversible Reactions A reversible reaction proceeds in both the forward and reverse directions. As a result there are two reaction rates: the rate of the forward reaction and the rate of the...
  • Things That Make You Go Hmmm…..

    Things That Make You Go Hmmm…..

    TREATMENT SEE FELINE LEUKEMIA VIRUS DENTAL SURGERY Whole mouth extraction of teeth may be necessary in cats with chronic stomatitis and gingivitis CLIENT INFO & PROGNOSIS Although FIV is morphologically and biochemically similar to HIV, it poses no threat to...
  • Principal Performance Evaluation System Documenting Principal Performance February

    Principal Performance Evaluation System Documenting Principal Performance February

    The Document Log provides opportunity for self-reflection, demonstration of quality work, and is a basis for two-way communication with evaluator. Artifacts may include captions providing background information since artifacts will be viewed out of original context. The Document Log may...