Review for Unit Test

Match it! Select the correct answer from the pull down...Good luck!

A _____________ fossiil forms whe n organisms or parts, like leaves,stems,flowers,fish,are presssed between layers of soft mud or clay that hsrden, squeezing almost all of the organism away.

Periods are divided in to ____?

Which Era did the first amphbians appear in?

Which Era did human first aappear in?

Which Era did mammals and birds first appear in?

Which law states that each rock layer is older than the one above it?

A _____________fossil forms when a mold is filled with sand or mud that hardens into the shape of the organism.

These types of fossils can be used to determine the relative age of rock layers. What are these fossils ccalled?