geologic time

The age of a rock given as the number of years since the rock formed.

• relative age
• half-life
• absolute age
• radioactive decay

One of three long units of geologic time between Precambrian and the present.

• evolution
• period
• geologic time scale
• era

An animal without a backbone.

• vertebrate
• carbon film
• invertebrate
• fossil

A record of the geologic events and life forms in Earth's history.

• index fossil
• half-life
• radioactive dating
• geologic time scale

The era characterized by dinosaurs and other large reptiles.

• paleozoic
• mesosoic
• precambrian
• cenozoic

The era after the Precambrian characterized by the growth of multicellular organisms like plants.

• mesozoic
• cenozoic
• paleozoic
• precambrian

Identify the Era:
This era saw the increase of both large and small mammals.

• Precambrian
• Paleozoic
• Mesozoic
• Cenozoic

The process by which all the different kinds of living things have changed over long periods of time,

• sedimentation
• erosion
• evolution
• deposition

The Cenozoic Era is often called "the Age of the ____"

• Dinosaurs
• Mammals
• Amphibians
• Reptiles

The dinosaurs died out ____million years ago.

• 57
• 125
• 65
• 250