What are fossils?
Remains of once-living organisms.
Where can you find almost every fossil?
In SEDIMENTARY rock.
What can scientists use fossils for to learn about?
The geography and organisms of the past.
What are fossil fuels?
Energy source made from decayed organic material.
How does coal form?
Peat gets covered by sedimentary rock, then pressure changes it into coal.
How do natural gas and oil form?
Pressure, bacteria, and heat on decaying organic material.
How are relative and absolute age different?
Relative age means lower rocks are older. Absolute age means fossils are the same age as rocks they're found in.
Name TWO conditions that are required for making fossils.
Rapid burial, hard body parts, and low oxygen environment.
What do you think happened to the fish?
It died and was buried rapidly.
Name TWO things that must first be assumed in order to conclude that fossils are millions of years old.
1. earth is billions of years old; 2. lower rocks are older; 3. fossils are the same age as rocks they're in; 4. elemental rates of decay are constant
