a model scientists use to describe the timing of events and the relationships between those events in earth’s history.

• geologic time scale

• era

• period

• epoch

when minerals replace the remains and they become rock; things like wood.

• Petrified

• Mold

• Cast

• Index

• Trace Fossil

when the shell remains and the contents dissolve

• Petrified

• Mold

• Cast

• Index

• Trace Fossil

when the mold becomes filled with minerals that are not a part of the original organism.

• Petrified

• Mold

• Cast

• Index

• Trace Fossil

a fossil found in a narrow time range but widely distributed around the earth; used to date rock layers.

• Petrified

• Mold

• Cast

• Index

• Trace Fossil

fossilized mark that is formed in soft sediment by the movement or actions of an animal.

• Petrified

• Mold

• Cast

• Index

• Trace Fossil

What Era were mammals first seen?

• Precambrian

• Paleozoic

• Mesozoic

• Cenozoic

According to paleontologists, how old is the Earth?

• 3.5 Billion Years Old

• 543 Million Years Old

• 57 Million Years Old

• 4.6 Billion Years Old

What type of rock do fossils form in?

• Igneous
• Sedimentary
• Metamorphic
• Classic

Which of the following statements about the fossil record is true?

• all organisms become fossils
• organisms having soft body parts make up most of the fossils
• all organisms that have shells become fossils
• the fossil record is incomplete