Create an account
How are fossils formed?
Living things die and are buried in sediment (sand, gravel, dirt, tar, ice, snow). The sediment slowly hardens into rocks and preserve the shape of the organism.
What are 8 fossil types?
Hard part, molds and casts, petrification, amber, mummification, frozen, tar, and trace fossil.
What is a molds and cast fossil?
Cavity in a rock where an organism was buried decays and leaves a hole that can be filled in with sediment.
What is a trace fossil?
Naturally preserved evidence of an animal's activity such as a footprint, burrow or dung.
What are the 5 types of fossils found in rock?
molds, casts, petrified fossils, carbon films, and trace fossils.
What are 7 ways rock layers form?
Floods, tsunamis, landslides, streams, tornadoes, glaciers, and volcanoes.
How do floods get rock layers to form?
Minerals and sediment gets carried by the water from one place to another.
How do fossils help us interpret the past?
Fossil records reveal information about plants, animals and environment in the past.
How does a carbon film fossil form?
Sediment covers an organism, the organism evaporates and becomes gasses. Then it escapes and only a thin layer of carbon is left behind.
What 2 things can we learn from fossils?
What the past was like, and what environment organisms lived in.
What is unconformity?
The surface where new rock layers meet a much older rock surface beneath them.
Heat transfer by convection is caused by differences of (blank) and density within a fluid
Why are deserts, tar pits, and ice good places to find body fossils?
Bacteria and other decomposes cannot thrive in these environment
What can you conclude from the fact that so many fossils involve shells, skeletons, and teeth?
These parts decay slower than other body parts
Although a cast fossil looks like an original bone or shell, how is it different?
It is made of rock
A geologist finds identical index fossils in a rock layer in the Grand Canyon in Arizona and a rock layer in northern Utah, more than 675 kilometers away. What inferences can she make about the ages of the two rock layers?
The two rock layers are about the same age
A leaf falls into a shallow water and is rapidly buried in the sediment that changes to rock over millions of years. Which type of fossil would be formed
A mold and cast
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together