Earth's History

How old do Paleontologists believe the Earth is?

• 3.6 million years old
• 3.6 billion years old
• 4.6 billion years old
• 4.6 million years old

Which of the following is the oldest?

• Rock Layer L
• Igneous Intrusion D
• Igneous Intrusion H
• Rock Layer E

Which of the following correctly lists the layers in order from oldest to youngest?

• A, B, C, D, E
• E, B, C, D, A
• E, D, C, B, A
• C, B, A, D, E

What is the youngest layer?

• A
• B
• C
• D

The rock formation labeled "P" is a(n)...

• fault
• igneous intrusion
• index fossil layer
• unconformity

Which rock formation is the youngest?
(Which happened last?)

• Rock Layer Q
• Rock Layer L
• Igneous Intrusion M
• Igneous Intrusion P

What is the oldest layer?

• B
• C
• D
• E

Most fossils are found in __________ rock layers

• metamorphic
• sedimentary
• igneous
• igneous and sedimentary

Certain fossils existed all over the world, but only for a short period of geologic time.  If a geologist finds this fossil in a layer of rock, he/she will be able to tell how old that rock layer is.  These are called

• intrusion fossils
  casts
• imprint fossils
• index fossils
• intrest fossils

The amount of time it takes for 50% of the remaining radioactive parent material to decay into stable daughter material is called

• radiocarbon dating
• radioactive decay
• half-life
• daughter product