A fuel formed from the remains of once living things
What is fossil fuel
100
An impression of an organism, formed when sediment hardens around the organism
What is mold
100
An event that results in the dying off of many species is called
What is mass extinction
100
A model of an organism, formed when sediment fills a mold and hardens
What is cast
100
A fossil of a type of organism that lived in many places during a relatively short time span
What is index fossil
200
Oil and natural gas start out as tiny sea organisms. Over time, their remains change so that eventually only two elements are left. Which two elements make up oil and natural gas?
Carbon and hydrogen
200
the remains or traces of a plant or animal that lived long ago
What is fossil
200
Chelsea was collecting fossils. She found one whose original material had been replaced by quartz. What type of fossil did she find?
What is petrified wood
200
Suppose you found fossils of sharks and other fish in a nearby forest. What could you infer about the area from these discoveries?
The area was once an ocean
200
What is a living fossil?
a living organism that looks similar to its ancient ancestors
300
Which life forms were common during the Mesozoic Era?