A Trip Through Geologic Time

The process by which all the different kinds of living thngs have changed over long periods of time is called

• evolution
• extinct
• geo time scale
• dead

Plant leaves may form a fossil called a _____________, a thin layer of carbon on rock.

• petrified fossil
• carbon film
• preserved reamin
• mold/cast

Fossils are almost always found in 

• metamorphic rock
• sedimentary rock
• igneous rock
• granite rock

Plants and animals first reached land during the 

• Mesozoic Era
• Cenozoic Era
• Paleozoic Era
• Precambrian

An animal w/ a backbone is called a (n) 

• invertebrate
• vertebrate
• spineless
• fish

Dinos ruled the Earth during the 

• Precambrian
• Cenozoic Era
• Mesozoic Era
• Paleozoic Era

A scientist who studies fossils is called a (n)

• rocket scientist
• astronaut
• paleontologist
• a cool guy

Geologists divide the Earth's long history into smaller units that make up the 

• fossil record
• time line
• life's time scale
• geologic time scale

Animals w/o backbones are called

• vertebrates
• jawless fishes
• mammals
• invertebrates

Index fossils are useful b/c they tell the _______________ age of rock layers

• absolute
• relative