ES08-3 GEOLOGICAL TIME SCALE

Which fossil is a replica of the original shape of the organism?

• cast
• mold
• trace
• preserved remains

Relative dating of rock layers tells us that the deeper we dig, _______.

• the younger the rocks get
• the smellier the rocks get
• the harder the rocks get
• the older the rocks get

The Geologic Time Scale is a record of what?

• old geologists
• sweet geology music
• the known history of rocks and fossils
• a list of every living thing ever

How old do Paleontologists believe the Earth is?

• 2015 years old
• 3.6 billion years old
• 4.6 billion years old
• 4.6 million years old

A bug stuck in amber is an example of what type of fossil?

• cast
• mold
• trace
• preserved remains

What type of rock do fossils form in?

• Igneous
• Sedimentary
• Metamorphic
• Classic

The fossil record shows that life on Earth has changed over time.  For example, paleontologists have found that older rocks contain fossils of

• organisms that are more complex than those alive today
• both simple and complex organisms
• only organisms that are alive today
• organisms that are simpler than those alive today

What do most scientists think caused the mass extinction of dinosaurs and other organisms at the end of the Cretaceous period?

• an object from space struck Earth
• volcanic eruptions covered large areas with lava
• an ice age covered most of Earth with ice
• The dinosaurs ate too many other organisms and then starved

The Paleozoic, Mesozoic, and Cenozoic are divisions in the geologic time scale called ____

• centuries
• layers
• periods
• eras