Question How do you think fossils form What
- Slides: 16
Question • How do you think fossils form? • What do you think that fossils tell us?
Fossils • Are preserved remains or traces of living things. • Provide evidence of how life has changed over time.
How fossils form • Most form when living things die and are buried by sediments • Sediments slowly harden into rock and preserve the shapes of the organisms
Sedimentary rock • Fossils usually found in this • Rock is made of hardened sediment.
Found • Animals and plants that lived in or near quiet water such as swamps, lakes, or shallow seas turn into fossils. • Dies = hardens and only hard parts leave fossils
Found • Fossils found in rock include molds and casts, petrified fossils, carbon films, and trace fossils. • Others preserved in tar, amber or ice
Mold • Is a hollow area in sediment in the shape of an organism or part of an organism • Forms when hard part such as a shell is buried in sediment
Cast • Fossil that is a copy of an organisms shape formed when minerals seep into a mold
Petrified fossils • Are fossils in which minerals replace all or part of an organism
Carbon film • Extremely thin coating of carbon on rock
Trace fossils • Provide evidence of the activities of ancient organisms. • Ex. fossil footprints, trails, and burrows
Paleontologists • Collect and classify fossils
Fossil record • Provides evidence about the history of life on earth • Shows that groups of organisms have changed over time • Shows fossils occur in a particular order
Scientific theory • Well tested concept that explains a wide range of observations
evolution • Is the gradual change in living things over long periods of time • Fossil record shows millions of type of organisms have evolved.
Extinct • No longer exists and will never live on earth again
- Think big think fast think ahead
- If you think you can you can poem
- Costa level 2 questions examples
- Clues to earth's past
- Three second rule driving
- Why according to robin and jay are people funny
- Think family ni
- So you think you can argue
- Choose the correct answers a-c a person who is
- Alan and susie an argument
- Fun facts about minecraft
- What do you think of when you hear the word family
- You have more potential than you think
- What makes plants grow
- What do you think of when you hear
- You can argue
- Present continuous affirmative negative interrogative